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Prevent oopsing in posix_acl_valid()

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If posix_acl_from_xattr() returns an error code, a negative address is
dereferenced causing an oops; fix by checking for error code first.

Signed-off-by: Daniel J Blueman <daniel.blueman@gmail.com>
Reviewed-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Daniel J Blueman 2011-05-03 16:44:13 +00:00 committed by Chris Mason
parent 7cf96da3ec
commit f5de939149
1 changed files with 3 additions and 2 deletions
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5
fs/btrfs/acl.c
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@ -178,12 +178,13 @@ static int btrfs_xattr_acl_set(struct dentry *dentry, const char *name,
if (value) {
acl = posix_acl_from_xattr(value, size);
if (IS_ERR(acl))
return PTR_ERR(acl);
if (acl) {
ret = posix_acl_valid(acl);
if (ret)
goto out;
} else if (IS_ERR(acl)) {
return PTR_ERR(acl);
}
}