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NFSv4.2: fix error handling in nfs42_proc_getxattr 

[ Upstream commit 4e3733fd2b ]

There is a slight issue with error handling code inside
nfs42_proc_getxattr(). If page allocating loop fails then we free the
failing page array element which is NULL but __free_page() can't deal with
NULL args.

Found by Linux Verification Center (linuxtesting.org).

Fixes: a1f26739cc ("NFSv4.2: improve page handling for GETXATTR")
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 14:58:58 +03:00 committed by Greg Kroah-Hartman
parent 05d8970cca
commit 9e2388d814
1 changed files with 2 additions and 3 deletions
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5
fs/nfs/nfs42proc.c
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@ -1360,7 +1360,6 @@ ssize_t nfs42_proc_getxattr(struct inode *inode, const char *name,
for (i = 0; i < np; i++) {
pages[i] = alloc_page(GFP_KERNEL);
if (!pages[i]) {
np = i + 1;
err = -ENOMEM;
goto out;
}
@ -1384,8 +1383,8 @@ ssize_t nfs42_proc_getxattr(struct inode *inode, const char *name,
} while (exception.retry);
out:
while (--np >= 0)
__free_page(pages[np]);
while (--i >= 0)
__free_page(pages[i]);
kfree(pages);
return err;