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drm/xe/nvm: Fix double-free on aux add failure

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After a successful auxiliary_device_init(), aux_dev->dev.release
(xe_nvm_release_dev()) is responsible for the kfree(nvm). When
there is failure with auxiliary_device_add(), driver will call
auxiliary_device_uninit(), which call put_device(). So that the
.release callback will be triggered to free the memory associated
with the auxiliary_device.

Move the kfree(nvm) into the auxiliary_device_init() failure path
and remove the err goto path to fix below error.

"
[   13.232905] ==================================================================
[   13.232911] BUG: KASAN: double-free in xe_nvm_init+0x751/0xf10 [xe]
[   13.233112] Free of addr ffff888120635000 by task systemd-udevd/273

[   13.233120] CPU: 8 UID: 0 PID: 273 Comm: systemd-udevd Not tainted 6.19.0-rc2-lgci-xe-kernel+ #225 PREEMPT(voluntary)
...
[   13.233125] Call Trace:
[   13.233126]  <TASK>
[   13.233127]  dump_stack_lvl+0x7f/0xc0
[   13.233132]  print_report+0xce/0x610
[   13.233136]  ? kasan_complete_mode_report_info+0x5d/0x1e0
[   13.233139]  ? xe_nvm_init+0x751/0xf10 [xe]
...
"

v2: drop err goto path. (Alexander)

Fixes: d4c3ed963e ("drm/xe: defer free of NVM auxiliary container to device release callback")
Reviewed-by: Nitin Gote <nitin.r.gote@intel.com>
Reviewed-by: Brian Nguyen <brian3.nguyen@intel.com>
Cc: Alexander Usyskin <alexander.usyskin@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Suggested-by: Brian Nguyen <brian3.nguyen@intel.com>
Signed-off-by: Shuicheng Lin <shuicheng.lin@intel.com>
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Link: https://patch.msgid.link/20260120183239.2966782-7-shuicheng.lin@intel.com
This commit is contained in:
Shuicheng Lin 2026-01-20 18:32:42 +00:00 committed by Ashutosh Dixit
parent 11035eab1b
commit a3187c0c2b
1 changed files with 5 additions and 7 deletions
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12
drivers/gpu/drm/xe/xe_nvm.c
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@ -164,19 +164,17 @@ int xe_nvm_init(struct xe_device *xe)
ret = auxiliary_device_init(aux_dev);
if (ret) {
drm_err(&xe->drm, "xe-nvm aux init failed %d\n", ret);
goto err;
kfree(nvm);
xe->nvm = NULL;
return ret;
}
ret = auxiliary_device_add(aux_dev);
if (ret) {
drm_err(&xe->drm, "xe-nvm aux add failed %d\n", ret);
auxiliary_device_uninit(aux_dev);
goto err;
xe->nvm = NULL;
return ret;
}
return devm_add_action_or_reset(xe->drm.dev, xe_nvm_fini, xe);
err:
kfree(nvm);
xe->nvm = NULL;
return ret;
}