accel/amdxdna: Fix use-after-free of mm_struct in job scheduler

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amdxdna_cmd_submit() stores current->mm in job->mm without holding any
reference. aie2_sched_job_run() later access job->mm from the DRM
scheduler worker thread. With only a raw pointer and no structural
reference, the mm_struct can be freed before the scheduler runs the job.

Fix this by calling mmgrab() to hold a structural mm_count reference for
the lifetime of the job, paired with mmdrop() in every cleanup path.

Fixes: aac243092b ("accel/amdxdna: Add command execution")
Reviewed-by: Max Zhen <max.zhen@amd.com>
Signed-off-by: Lizhi Hou <lizhi.hou@amd.com>
Link: https://patch.msgid.link/20260716151305.1595780-1-lizhi.hou@amd.com

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Lizhi Hou 2026-07-16 08:13:05 -07:00

parent 266cddf7bd

commit faebb7ba1a

1 changed files with 4 additions and 0 deletions

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drivers/accel/amdxdna/amdxdna_ctx.c

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