| From | Sasha Levin <> | Subject | [PATCH AUTOSEL 4.19 225/252] cifs: fix NULL dereference in match_prepath | Date | Fri, 14 Feb 2020 11:11:20 -0500 |
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From: Ronnie Sahlberg <lsahlber@redhat.com>
[ Upstream commit fe1292686333d1dadaf84091f585ee903b9ddb84 ]
RHBZ: 1760879
Fix an oops in match_prepath() by making sure that the prepath string is not NULL before we pass it into strcmp().
This is similar to other checks we make for example in cifs_root_iget()
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com> Signed-off-by: Steve French <stfrench@microsoft.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- fs/cifs/connect.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 576cf71576da1..6c62ce40608a1 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -3342,8 +3342,10 @@ match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data) { struct cifs_sb_info *old = CIFS_SB(sb); struct cifs_sb_info *new = mnt_data->cifs_sb; - bool old_set = old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH; - bool new_set = new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH; + bool old_set = (old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) && + old->prepath; + bool new_set = (new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) && + new->prepath; if (old_set && new_set && !strcmp(new->prepath, old->prepath)) return 1; -- 2.20.1
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