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NFSv4: fix out path in __nfs4_get_acl_uncached

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[ Upstream commit f4e89f1a6d ]

Another highly rare error case when a page allocating loop (inside
__nfs4_get_acl_uncached, this time) is not properly unwound on error.
Since pages array is allocated being uninitialized, need to free only
lower array indices. NULL checks were useful before commit 62a1573fcf
("NFSv4 fix acl retrieval over krb5i/krb5p mounts") when the array had
been initialized to zero on stack.

Found by Linux Verification Center (linuxtesting.org).

Fixes: 62a1573fcf ("NFSv4 fix acl retrieval over krb5i/krb5p mounts")
Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru>
Reviewed-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Fedor Pchelkin
2023-07-25 14:59:30 +03:00
committed by Greg Kroah-Hartman
parent 4a289d123f
commit d9aac9cdd6
1 changed files with 2 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
fs/nfs/nfs4proc.c
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@@ -5995,9 +5995,8 @@ static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf,
out_ok:
ret = res.acl_len;
out_free:
for (i = 0; i < npages; i++)
if (pages[i])
__free_page(pages[i]);
while (--i >= 0)
__free_page(pages[i]);
if (res.acl_scratch)
__free_page(res.acl_scratch);
kfree(pages);