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drm/gpusvm: Fix MM reference leak in drm_gpusvm_range_evict

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If kvmalloc_array() fails in drm_gpusvm_range_evict(), the MM
reference acquired earlier is not released, resulting in a reference
leak.

Fix this by dropping the MM reference on the kvmalloc_array()
failure path.

Fixes: 99624bdff8 ("drm/gpusvm: Add support for GPU Shared Virtual Memory")
Cc: stable@vger.kernel.org
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Link: https://patch.msgid.link/20260714170025.3487974-1-matthew.brost@intel.com
This commit is contained in:
Matthew Brost 2026-07-14 10:00:25 -07:00
parent 17e2030f37
commit 847b371deb
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/drm_gpusvm.c
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@ -1753,8 +1753,10 @@ int drm_gpusvm_range_evict(struct drm_gpusvm *gpusvm,
return -EFAULT;
pfns = kvmalloc_array(npages, sizeof(*pfns), GFP_KERNEL);
if (!pfns)
if (!pfns) {
mmput(mm);
return -ENOMEM;
}
hmm_range.hmm_pfns = pfns;
while (!time_after(jiffies, timeout)) {