89b59a84cb
Following warning reported by KASAN during driver unload ================================================================== BUG: KASAN: double-free in bnxt_remove_one+0x103/0x200 [bnxt_en] Free of addr ffff88814e8dd4c0 by task rmmod/17469 CPU: 47 PID: 17469 Comm: rmmod Kdump: loaded Tainted: G S 6.2.0-rc7+ #2 Hardware name: Dell Inc. PowerEdge R740/01YM03, BIOS 2.3.10 08/15/2019 Call Trace: <TASK> dump_stack_lvl+0x33/0x46 print_report+0x17b/0x4b3 ? __call_rcu_common.constprop.79+0x27e/0x8c0 ? __pfx_free_object_rcu+0x10/0x10 ? __virt_addr_valid+0xe3/0x160 ? bnxt_remove_one+0x103/0x200 [bnxt_en] kasan_report_invalid_free+0x64/0xd0 ? bnxt_remove_one+0x103/0x200 [bnxt_en] ? bnxt_remove_one+0x103/0x200 [bnxt_en] __kasan_slab_free+0x179/0x1c0 ? bnxt_remove_one+0x103/0x200 [bnxt_en] __kmem_cache_free+0x194/0x350 bnxt_remove_one+0x103/0x200 [bnxt_en] pci_device_remove+0x62/0x110 device_release_driver_internal+0xf6/0x1c0 driver_detach+0x76/0xe0 bus_remove_driver+0x89/0x160 pci_unregister_driver+0x26/0x110 ? strncpy_from_user+0x188/0x1c0 bnxt_exit+0xc/0x24 [bnxt_en] __x64_sys_delete_module+0x21f/0x390 ? __pfx___x64_sys_delete_module+0x10/0x10 ? __pfx_mem_cgroup_handle_over_high+0x10/0x10 ? _raw_spin_lock+0x87/0xe0 ? __pfx__raw_spin_lock+0x10/0x10 ? __audit_syscall_entry+0x185/0x210 ? ktime_get_coarse_real_ts64+0x51/0x80 ? syscall_trace_enter.isra.18+0x126/0x1a0 do_syscall_64+0x37/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc RIP: 0033:0x7effcb6fd71b Code: 73 01 c3 48 8b 0d 6d 17 2c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 b0 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 3d 17 2c 00 f7 d8 64 89 01 48 RSP: 002b:00007ffeada270b8 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0 RAX: ffffffffffffffda RBX: 00005623660e0750 RCX: 00007effcb6fd71b RDX: 000000000000000a RSI: 0000000000000800 RDI: 00005623660e07b8 RBP: 0000000000000000 R08: 00007ffeada26031 R09: 0000000000000000 R10: 00007effcb771280 R11: 0000000000000206 R12: 00007ffeada272e0 R13: 00007ffeada28bc4 R14: 00005623660e02a0 R15: 00005623660e0750 </TASK> Auxiliary device structures are freed in bnxt_aux_dev_release. So avoid calling kfree from bnxt_remove_one. Also, set bp->edev to NULL before freeing the auxilary private structure. Fixes: d80d88b0dfff ("bnxt_en: Add auxiliary driver support") Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com> Reviewed-by: Andy Gospodarek <andrew.gospodarek@broadcom.com> Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com> Signed-off-by: Michael Chan <michael.chan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.