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Guchun Chen 56488df9f4 drm/amdgpu: fix NULL pointer dereference 
[ Upstream commit 3c3dc654333f6389803cdcaf03912e94173ae510 ]

ttm->sg needs to be checked before accessing its child member.

Call Trace:
 amdgpu_ttm_backend_destroy+0x12/0x70 [amdgpu]
 ttm_bo_cleanup_memtype_use+0x3a/0x60 [ttm]
 ttm_bo_release+0x17d/0x300 [ttm]
 amdgpu_bo_unref+0x1a/0x30 [amdgpu]
 amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu+0x78b/0x8b0 [amdgpu]
 kfd_ioctl_alloc_memory_of_gpu+0x118/0x220 [amdgpu]
 kfd_ioctl+0x222/0x400 [amdgpu]
 ? kfd_dev_is_large_bar+0x90/0x90 [amdgpu]
 __x64_sys_ioctl+0x8e/0xd0
 ? __context_tracking_exit+0x52/0x90
 do_syscall_64+0x33/0x80
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f97f264d317
Code: b3 66 90 48 8b 05 71 4b 2d 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 41 4b 2d 00 f7 d8 64 89 01 48
RSP: 002b:00007ffdb402c338 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f97f3cc63a0 RCX: 00007f97f264d317
RDX: 00007ffdb402c380 RSI: 00000000c0284b16 RDI: 0000000000000003
RBP: 00007ffdb402c380 R08: 00007ffdb402c428 R09: 00000000c4000004
R10: 00000000c4000004 R11: 0000000000000246 R12: 00000000c0284b16
R13: 0000000000000003 R14: 00007f97f3cc63a0 R15: 00007f8836200000

Signed-off-by: Guchun Chen <guchun.chen@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-05-11 14:47:30 +02:00
arch ARM: dts: at91: change the key code of the gpio key 2021-05-11 14:47:20 +02:00
block
certs
crypto crypto: api - check for ERR pointers in crypto_destroy_tfm() 2021-05-11 14:47:16 +02:00
Documentation
drivers drm/amdgpu: fix NULL pointer dereference 2021-05-11 14:47:30 +02:00
fs btrfs: convert logic BUG_ON()'s in replace_path to ASSERT()'s 2021-05-11 14:47:22 +02:00
include power: supply: bq27xxx: fix power_avg for newer ICs 2021-05-11 14:47:24 +02:00
init
ipc
kernel sched/fair: Ignore percpu threads for imbalance pulls 2021-05-11 14:47:29 +02:00
lib dyndbg: fix parsing file query without a line-range suffix 2021-05-11 14:47:11 +02:00
LICENSES
mm
net net: qrtr: Avoid potential use after free in MHI send 2021-05-07 11:04:31 +02:00
samples
scripts
security
sound ALSA: usb-audio: Add MIDI quirk for Vox ToneLab EX 2021-05-07 11:04:33 +02:00
tools selftests/resctrl: Fix checking for < 0 for unsigned values 2021-05-11 14:47:27 +02:00
usr
virt
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COPYING
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Makefile Linux 5.10.35 2021-05-07 11:04:33 +02:00
README

README 

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.