Sagar Kamble
c37c1b5474
gpu: nvgpu: fix null pointer access in nvgpu_vm_find_mapping
mapped_buffer sgt is deallocated by dma_buf_unmap_attachment in the
function nvgpu_vm_find_mapping if it is previously mapped. Debug
print referred to the sgt page after deallocating hence move it
before deallocation.
Fix below null pointer dereference issue:
[ 34.692659] Unable to handle kernel NULL pointer dereference
at virtual address 0000000000000000
...
[ 34.699820] Hardware name: Jetson-AGX (DT)
[ 34.709136] pc : nvgpu_vm_find_mapping+0xcc/0x240 [nvgpu]
[ 34.714377] lr : nvgpu_vm_find_mapping+0xa4/0x240 [nvgpu]
...
[ 34.804523] Call trace:
[ 34.807093] nvgpu_vm_find_mapping+0xcc/0x240 [nvgpu]
[ 34.812195] nvgpu_vm_map+0xd4/0x480 [nvgpu]
[ 34.816168] nvgpu_vm_map_linux+0x15c/0x1c8 [nvgpu]
[ 34.821237] nvgpu_vm_map_buffer+0x14c/0x270 [nvgpu]
[ 34.825962] gk20a_as_dev_ioctl+0x320/0xfe0 [nvgpu]
[ 34.830955] do_vfs_ioctl+0xb8/0xa40
[ 34.834449] ksys_ioctl+0x80/0xb8
[ 34.837430] __arm64_sys_ioctl+0x1c/0x28
[ 34.841630] el0_svc_handler+0x80/0x1a8
[ 34.845129] el0_svc+0x8/0xc
[ 34.848106] Code: f9400021 d360ff3a b9406a62 f940007c (f9400034)
[ 34.854227] ---[ end trace 1d8c4efb211dc317 ]---
Bug 2834141
Change-Id: I281ac21071fcc2e3e6f3685798c8e77daba6d4a4
Signed-off-by: Sagar Kamble <skamble@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2323361
Tested-by: Debarshi Dutta <ddutta@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: automaticguardword <automaticguardword@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
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