diff options
| author | Cong Wang <xiyou.wangcong@gmail.com> | 2017-02-22 15:40:53 -0800 |
|---|---|---|
| committer | Sasha Levin <alexander.levin@verizon.com> | 2017-06-13 09:29:19 -0400 |
| commit | 16968228efa5496a6a964048de1b77a344120af8 (patch) | |
| tree | 43a0b1881a520d6b4cf9b62f9d9bbefb6491adfa /fs | |
| parent | c41e1ba879616a28e527c2ee465dfd177a4a9ecf (diff) | |
9p: fix a potential acl leak
[ Upstream commit b5c66bab72a6a65edb15beb60b90d3cb84c5763b ]
posix_acl_update_mode() could possibly clear 'acl', if so we leak the
memory pointed by 'acl'. Save this pointer before calling
posix_acl_update_mode() and release the memory if 'acl' really gets
cleared.
Link: http://lkml.kernel.org/r/1486678332-2430-1-git-send-email-xiyou.wangcong@gmail.com
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Reported-by: Mark Salyzyn <salyzyn@android.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Greg Kurz <groug@kaod.org>
Cc: Eric Van Hensbergen <ericvh@gmail.com>
Cc: Ron Minnich <rminnich@sandia.gov>
Cc: Latchesar Ionkov <lucho@ionkov.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/9p/acl.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/9p/acl.c b/fs/9p/acl.c index de59b4892bfb..5c651324e976 100644 --- a/fs/9p/acl.c +++ b/fs/9p/acl.c @@ -321,6 +321,7 @@ static int v9fs_xattr_set_acl(struct dentry *dentry, const char *name, name = POSIX_ACL_XATTR_ACCESS; if (acl) { struct iattr iattr; + struct posix_acl *old_acl = acl; retval = posix_acl_update_mode(inode, &iattr.ia_mode, &acl); if (retval) @@ -331,6 +332,7 @@ static int v9fs_xattr_set_acl(struct dentry *dentry, const char *name, * by the mode bits. So don't * update ACL. */ + posix_acl_release(old_acl); value = NULL; size = 0; } |