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drm/xe: Fix possible UAF in guc_exec_queue_process_msg

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Store xe_device ahead of processing message as message can be free'd in
some cases.

v2:
 - Including missing local changes
v3:
 - Resend for CI

Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/r/202407231445.rpisd1vA-lkp@intel.com/
Fixes: d930c19fdf ("drm/xe: Build PM into GuC CT layer")
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240724164341.1848954-1-matthew.brost@intel.com
This commit is contained in:
Matthew Brost 2024-07-24 09:43:41 -07:00
parent b461195781
commit 1a394b4f50
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/xe/xe_guc_submit.c
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@ -1389,6 +1389,8 @@ static void __guc_exec_queue_process_msg_resume(struct xe_sched_msg *msg)
static void guc_exec_queue_process_msg(struct xe_sched_msg *msg)
{
struct xe_device *xe = guc_to_xe(exec_queue_to_guc(msg->private_data));
trace_xe_sched_msg_recv(msg);
switch (msg->opcode) {
@ -1408,7 +1410,7 @@ static void guc_exec_queue_process_msg(struct xe_sched_msg *msg)
XE_WARN_ON("Unknown message type");
}
xe_pm_runtime_put(guc_to_xe(exec_queue_to_guc(msg->private_data)));
xe_pm_runtime_put(xe);
}
static const struct drm_sched_backend_ops drm_sched_ops = {