linux/drivers/char/ipmi, branch v4.19

ipmi: Fix NULL pointer dereference in ssif_probe

2018-08-31T19:13:56Z

There is a potential execution path in which function ssif_info_find() returns NULL, hence there is a NULL pointer dereference when accessing pointer *addr_info* Fix this by null checking *addr_info* before dereferencing it. Addresses-Coverity-ID: 1473145 ("Explicit null dereferenced") Fixes: e333054a91d1 ("ipmi: Fix I2C client removal in the SSIF driver") Signed-off-by: Gustavo A. R. Silva Signed-off-by: Corey Minyard

ipmi: Fix I2C client removal in the SSIF driver

2018-08-31T13:43:12Z

The SSIF driver was removing any client that came in through the platform interface, but it should only remove clients that it added. On a failure in the probe function, this could result in the following oops when the driver is removed and the client gets unregistered twice: CPU: 107 PID: 30266 Comm: rmmod Not tainted 4.18.0+ #80 Hardware name: Cavium Inc. Saber/Saber, BIOS Cavium reference firmware version 7.0 08/04/2018 pstate: 60400009 (nZCv daif +PAN -UAO) pc : kernfs_find_ns+0x28/0x120 lr : kernfs_find_and_get_ns+0x40/0x60 sp : ffff00002310fb50 x29: ffff00002310fb50 x28: ffff800a8240f800 x27: 0000000000000000 x26: 0000000000000000 x25: 0000000056000000 x24: ffff000009073000 x23: ffff000008998b38 x22: 0000000000000000 x21: ffff800ed86de820 x20: 0000000000000000 x19: ffff00000913a1d8 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 5300737265766972 x13: 643d4d4554535953 x12: 0000000000000030 x11: 0000000000000030 x10: 0101010101010101 x9 : ffff800ea06cc3f9 x8 : 0000000000000000 x7 : 0000000000000141 x6 : ffff000009073000 x5 : ffff800adb706b00 x4 : 0000000000000000 x3 : 00000000ffffffff x2 : 0000000000000000 x1 : ffff000008998b38 x0 : ffff000008356760 Process rmmod (pid: 30266, stack limit = 0x00000000e218418d) Call trace: kernfs_find_ns+0x28/0x120 kernfs_find_and_get_ns+0x40/0x60 sysfs_unmerge_group+0x2c/0x6c dpm_sysfs_remove+0x34/0x70 device_del+0x58/0x30c device_unregister+0x30/0x7c i2c_unregister_device+0x84/0x90 [i2c_core] ssif_platform_remove+0x38/0x98 [ipmi_ssif] platform_drv_remove+0x2c/0x6c device_release_driver_internal+0x168/0x1f8 driver_detach+0x50/0xbc bus_remove_driver+0x74/0xe8 driver_unregister+0x34/0x5c platform_driver_unregister+0x20/0x2c cleanup_ipmi_ssif+0x50/0xd82c [ipmi_ssif] __arm64_sys_delete_module+0x1b4/0x220 el0_svc_handler+0x104/0x160 el0_svc+0x8/0xc Code: aa1e03e0 aa0203f6 aa0103f7 d503201f (7940e280) ---[ end trace 09f0e34cce8e2d8c ]--- Kernel panic - not syncing: Fatal exception SMP: stopping secondary CPUs Kernel Offset: disabled CPU features: 0x23800c38 So track the clients that the SSIF driver adds and only remove those. Reported-by: George Cherian Signed-off-by: Corey Minyard Tested-by: George Cherian Cc: # 4.14.x

ipmi: Move BT capabilities detection to the detect call

2018-08-31T13:42:59Z

The capabilities detection was being done as part of the normal state machine, but it was possible for it to be running while the upper layers of the IPMI driver were initializing the device, resulting in error and failure to initialize. Move the capabilities detection to the the detect function, so it's done before anything else runs on the device. This also simplifies the state machine and removes some code, as a bonus. Signed-off-by: Corey Minyard Reported-by: Andrew Banman Tested-by: Andrew Banman Cc:

ipmi: Rework SMI registration failure

2018-08-31T13:42:29Z

There were certain situations where ipmi_register_smi() would return a failure, but the interface would still be registered and would need to be unregistered. This is obviously a bad design and resulted in an oops in certain failure cases. If the interface is started up in ipmi_register_smi(), then an error occurs, shut down the interface there so the cleanup can be done properly. Fix the various smi users, too. Signed-off-by: Corey Minyard Reported-by: Justin Ernst Tested-by: Justin Ernst Cc: Andrew Banman Cc: Russ Anderson Cc: # 4.18.x

ipmi: kcs_bmc: don't change device name

2018-08-30T19:55:18Z

kcs_bmc_alloc(...) calls dev_set_name(...) which is incorrect as most bus driver frameworks, platform_driver in particular, assume that they are able to set the device name themselves. Signed-off-by: Benjamin Fair Signed-off-by: Corey Minyard

ipmi: kcs_bmc: fix IRQ exception if the channel is not open

2018-06-24T23:11:39Z

When kcs_bmc_handle_event calls kcs_force_abort function to handle the not open (no user running) KCS channel transaction, the returned status value -ENODEV causes the low level IRQ handler indicating that the irq was not for him by returning IRQ_NONE. After some time, this IRQ will be treated to be spurious one, and the exception dump happens. irq 30: nobody cared (try booting with the "irqpoll" option) CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.10.15-npcm750 #1 Hardware name: NPCMX50 Chip family [] (unwind_backtrace) from [] (show_stack+0x20/0x24) [] (show_stack) from [] (dump_stack+0x8c/0xa0) [] (dump_stack) from [] (__report_bad_irq+0x3c/0xdc) [] (__report_bad_irq) from [] (note_interrupt+0x29c/0x2ec) [] (note_interrupt) from [] (handle_irq_event_percpu+0x5c/0x68) [] (handle_irq_event_percpu) from [] (handle_irq_event+0x48/0x6c) [] (handle_irq_event) from [] (handle_fasteoi_irq+0xc8/0x198) [] (handle_fasteoi_irq) from [] (__handle_domain_irq+0x90/0xe8) [] (__handle_domain_irq) from [] (gic_handle_irq+0x58/0x9c) [] (gic_handle_irq) from [] (__irq_svc+0x6c/0x90) Exception stack(0xc0a01de8 to 0xc0a01e30) 1de0: 00002080 c0a6fbc0 00000000 00000000 00000000 c096d294 1e00: 00000000 00000001 dc406400 f03ff100 00000082 c0a01e94 c0a6fbc0 c0a01e38 1e20: 00200102 c01015bc 60000113 ffffffff [] (__irq_svc) from [] (__do_softirq+0xbc/0x358) [] (__do_softirq) from [] (irq_exit+0xb8/0xec) [] (irq_exit) from [] (__handle_domain_irq+0x94/0xe8) [] (__handle_domain_irq) from [] (gic_handle_irq+0x58/0x9c) [] (gic_handle_irq) from [] (__irq_svc+0x6c/0x90) Exception stack(0xc0a01ef8 to 0xc0a01f40) 1ee0: 00000000 000003ae 1f00: dcc0f338 c0111060 c0a00000 c0a0cc44 c0a0cbe4 c0a1c22b c07bc218 00000001 1f20: dcffca40 c0a01f54 c0a01f58 c0a01f48 c0103524 c0103528 60000013 ffffffff [] (__irq_svc) from [] (arch_cpu_idle+0x48/0x4c) [] (arch_cpu_idle) from [] (default_idle_call+0x30/0x3c) [] (default_idle_call) from [] (do_idle+0xc8/0x134) [] (do_idle) from [] (cpu_startup_entry+0x28/0x2c) [] (cpu_startup_entry) from [] (rest_init+0x84/0x88) [] (rest_init) from [] (start_kernel+0x388/0x394) [] (start_kernel) from [<0000807c>] (0x807c) handlers: [] npcm7xx_kcs_irq Disabling IRQ #30 It needs to change the returned status from -ENODEV to 0. The -ENODEV was originally used to tell the low level IRQ handler that no user was running, but not consider the IRQ handling desgin. And multiple KCS channels share one IRQ handler, it needs to check the IBF flag before doing force abort. If the IBF is set, after handling, return 0 to low level IRQ handler to indicate that the IRQ is handled. Signed-off-by: Haiyue Wang Signed-off-by: Corey Minyard

ipmi: Cleanup oops on initialization failure

2018-06-24T23:11:38Z

Commit 93c303d2045b3 "ipmi_si: Clean up shutdown a bit" didn't copy the behavior of the cleanup in one spot, it needed to check for a non-NULL interface before cleaning it up. Reported-by: Meelis Roos Signed-off-by: Corey Minyard Tested-by: Meelis Roos

treewide: kzalloc() -> kcalloc()

2018-06-12T23:19:22Z

The kzalloc() function has a 2-factor argument form, kcalloc(). This patch replaces cases of: kzalloc(a * b, gfp) with: kcalloc(a * b, gfp) as well as handling cases of: kzalloc(a * b * c, gfp) with: kzalloc(array3_size(a, b, c), gfp) as it's slightly less ugly than: kzalloc_array(array_size(a, b), c, gfp) This does, however, attempt to ignore constant size factors like: kzalloc(4 * 1024, gfp) though any constants defined via macros get caught up in the conversion. Any factors with a sizeof() of "unsigned char", "char", and "u8" were dropped, since they're redundant. The Coccinelle script used for this was: // Fix redundant parens around sizeof(). @@ type TYPE; expression THING, E; @@ ( kzalloc( - (sizeof(TYPE)) * E + sizeof(TYPE) * E , ...) | kzalloc( - (sizeof(THING)) * E + sizeof(THING) * E , ...) ) // Drop single-byte sizes and redundant parens. @@ expression COUNT; typedef u8; typedef __u8; @@ ( kzalloc( - sizeof(u8) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(__u8) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(char) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(unsigned char) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(u8) * COUNT + COUNT , ...) | kzalloc( - sizeof(__u8) * COUNT + COUNT , ...) | kzalloc( - sizeof(char) * COUNT + COUNT , ...) | kzalloc( - sizeof(unsigned char) * COUNT + COUNT , ...) ) // 2-factor product with sizeof(type/expression) and identifier or constant. @@ type TYPE; expression THING; identifier COUNT_ID; constant COUNT_CONST; @@ ( - kzalloc + kcalloc ( - sizeof(TYPE) * (COUNT_ID) + COUNT_ID, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * COUNT_ID + COUNT_ID, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * (COUNT_CONST) + COUNT_CONST, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * COUNT_CONST + COUNT_CONST, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * (COUNT_ID) + COUNT_ID, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * COUNT_ID + COUNT_ID, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * (COUNT_CONST) + COUNT_CONST, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * COUNT_CONST + COUNT_CONST, sizeof(THING) , ...) ) // 2-factor product, only identifiers. @@ identifier SIZE, COUNT; @@ - kzalloc + kcalloc ( - SIZE * COUNT + COUNT, SIZE , ...) // 3-factor product with 1 sizeof(type) or sizeof(expression), with // redundant parens removed. @@ expression THING; identifier STRIDE, COUNT; type TYPE; @@ ( kzalloc( - sizeof(TYPE) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(TYPE) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(TYPE) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(TYPE) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(THING) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kzalloc( - sizeof(THING) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kzalloc( - sizeof(THING) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kzalloc( - sizeof(THING) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) ) // 3-factor product with 2 sizeof(variable), with redundant parens removed. @@ expression THING1, THING2; identifier COUNT; type TYPE1, TYPE2; @@ ( kzalloc( - sizeof(TYPE1) * sizeof(TYPE2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | kzalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | kzalloc( - sizeof(THING1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | kzalloc( - sizeof(THING1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | kzalloc( - sizeof(TYPE1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) | kzalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) ) // 3-factor product, only identifiers, with redundant parens removed. @@ identifier STRIDE, SIZE, COUNT; @@ ( kzalloc( - (COUNT) * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - (COUNT) * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - (COUNT) * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - (COUNT) * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) ) // Any remaining multi-factor products, first at least 3-factor products, // when they're not all constants... @@ expression E1, E2, E3; constant C1, C2, C3; @@ ( kzalloc(C1 * C2 * C3, ...) | kzalloc( - (E1) * E2 * E3 + array3_size(E1, E2, E3) , ...) | kzalloc( - (E1) * (E2) * E3 + array3_size(E1, E2, E3) , ...) | kzalloc( - (E1) * (E2) * (E3) + array3_size(E1, E2, E3) , ...) | kzalloc( - E1 * E2 * E3 + array3_size(E1, E2, E3) , ...) ) // And then all remaining 2 factors products when they're not all constants, // keeping sizeof() as the second factor argument. @@ expression THING, E1, E2; type TYPE; constant C1, C2, C3; @@ ( kzalloc(sizeof(THING) * C2, ...) | kzalloc(sizeof(TYPE) * C2, ...) | kzalloc(C1 * C2 * C3, ...) | kzalloc(C1 * C2, ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * (E2) + E2, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * E2 + E2, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * (E2) + E2, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * E2 + E2, sizeof(THING) , ...) | - kzalloc + kcalloc ( - (E1) * E2 + E1, E2 , ...) | - kzalloc + kcalloc ( - (E1) * (E2) + E1, E2 , ...) | - kzalloc + kcalloc ( - E1 * E2 + E1, E2 , ...) ) Signed-off-by: Kees Cook

ipmi: Properly release srcu locks on error conditions

2018-05-24T20:08:30Z

When SRCU was added for handling hotplug, some error conditions were not handled properly. Signed-off-by: Corey Minyard

ipmi: NPCM7xx KCS BMC: enable interrupt to the host

2018-05-23T13:29:23Z

Original kcs_bmc_npcm7xx.c was missing enabling to send interrupt to the host on writes to output buffer. This patch fixes it by setting the bits that enables the generation of IRQn events by hardware control based on the status of the OBF flag. Signed-off-by: Avi Fishman Reviewed-by: Haiyue Wang Signed-off-by: Corey Minyard