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mm: userfaultfd: add new UFFDIO_POISON ioctl: fix

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Smatch has observed that pte_offset_map_lock() is now allowed to fail, and
then ptl should not be unlocked.  Use -EAGAIN here like elsewhere.

Link: https://lkml.kernel.org/r/bc7bba61-d34f-ad3a-ccf1-c191585ef851@google.com
Signed-off-by: Hugh Dickins <hughd@google.com>
Reviewed-by: Axel Rasmussen <axelrasmussen@google.com>
Cc: Dan Carpenter <dan.carpenter@linaro.org>
Cc: Peter Xu <peterx@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Hugh Dickins 2023-07-11 18:27:17 -07:00 • committed by Andrew Morton
parent fc71884a5f
commit 597425df4f
1 changed files with 4 additions and 0 deletions
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4
mm/userfaultfd.c
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@ -300,7 +300,10 @@ static int mfill_atomic_pte_poison(pmd_t *dst_pmd,
spinlock_t *ptl;
_dst_pte = make_pte_marker(PTE_MARKER_POISONED);
ret = -EAGAIN;
dst_pte = pte_offset_map_lock(dst_mm, dst_pmd, dst_addr, &ptl);
if (!dst_pte)
goto out;
if (mfill_file_over_size(dst_vma, dst_addr)) {
ret = -EFAULT;
@ -319,6 +322,7 @@ static int mfill_atomic_pte_poison(pmd_t *dst_pmd,
ret = 0;
out_unlock:
pte_unmap_unlock(dst_pte, ptl);
out:
return ret;
}