Sagar Kamble 9f8d5acfbb gpu: nvgpu: fix the return value from gk20a_mm_pin ...

The return value in case of failure of dma_buf_attach and
dma_buf_map_attachment was ignored and NULL was returned.
This would lead to following null pointer access. Fix it.

[  293.622880] Unable to handle kernel NULL pointer dereference
               at virtual address 0000000000000000
...
[  293.711860] Hardware name: quill (DT)
[  293.720393] pc : nvgpu_linux_sgt_create+0x14/0xa8 [nvgpu]
[  293.725871] lr : nvgpu_vm_map_linux+0x104/0x1c8 [nvgpu]
...
[  293.813934] Call trace:
[  293.816455]  nvgpu_linux_sgt_create+0x14/0xa8 [nvgpu]
[  293.821573]  nvgpu_vm_map_linux+0x104/0x1c8 [nvgpu]
[  293.826515]  nvgpu_vm_map_buffer+0x120/0x290 [nvgpu]
[  293.831542]  gk20a_as_dev_ioctl+0x364/0xfb8 [nvgpu]
[  293.836416]  ksys_ioctl+0x17c/0xba8
[  293.839899]  __arm64_sys_ioctl+0x18/0x28
[  293.843817]  do_el0_svc+0xf8/0x1b8
[  293.847214]  el0_sync_handler+0x11c/0x28c
[  293.851217]  el0_sync+0x140/0x180

Bug 2834141

Change-Id: I0d9e863d0326946c8091bfb1b907b62b055f7272
Signed-off-by: Sagar Kamble <skamble@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2332204
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: automaticguardword <automaticguardword@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-by: Debarshi Dutta <ddutta@nvidia.com>
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit

2020-12-15 14:13:28 -06:00

2.9 KiB

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