| From | Sasha Levin <> | Subject | [PATCH AUTOSEL 5.12 102/102] cifs: prevent NULL deref in cifs_compose_mount_options() | Date | Wed, 14 Jul 2021 15:40:35 -0400 |
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From: Paulo Alcantara <pc@cjr.nz>
[ Upstream commit 03313d1c3a2f086bb60920607ab79ac8f8578306 ]
The optional @ref parameter might contain an NULL node_name, so prevent dereferencing it in cifs_compose_mount_options().
Addresses-Coverity: 1476408 ("Explicit null dereferenced") Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz> Signed-off-by: Steve French <stfrench@microsoft.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- fs/cifs/cifs_dfs_ref.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/fs/cifs/cifs_dfs_ref.c b/fs/cifs/cifs_dfs_ref.c index 6b1ce4efb591..2891089aadbb 100644 --- a/fs/cifs/cifs_dfs_ref.c +++ b/fs/cifs/cifs_dfs_ref.c @@ -151,6 +151,9 @@ char *cifs_compose_mount_options(const char *sb_mountdata, return ERR_PTR(-EINVAL); if (ref) { + if (WARN_ON_ONCE(!ref->node_name || ref->path_consumed < 0)) + return ERR_PTR(-EINVAL); + if (strlen(fullpath) - ref->path_consumed) { prepath = fullpath + ref->path_consumed; /* skip initial delimiter */ -- 2.30.2
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