This is a note to let you know that I've just added the patch titled
NFSv4: fix out path in __nfs4_get_acl_uncached
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nfsv4-fix-out-path-in-__nfs4_get_acl_uncached.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit c909d8ca1540286544381831cf0c93572377c047
Author: Fedor Pchelkin <pchelkin@xxxxxxxxx>
Date: Tue Jul 25 14:59:30 2023 +0300
NFSv4: fix out path in __nfs4_get_acl_uncached
[ Upstream commit f4e89f1a6dab4c063fc1e823cc9dddc408ff40cf ]
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 62a1573fcf84
("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: 62a1573fcf84 ("NFSv4 fix acl retrieval over krb5i/krb5p mounts")
Signed-off-by: Fedor Pchelkin <pchelkin@xxxxxxxxx>
Reviewed-by: Benjamin Coddington <bcodding@xxxxxxxxxx>
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index b1ec9b5d06e58..31bf3e9dc7a56 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -5964,9 +5964,8 @@ static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t bu
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);
