diff options
| author | Paulo Alcantara <pc@manguebit.com> | 2023-12-05 21:49:29 -0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-12-13 18:18:17 +0100 |
| commit | d99376b70247394b39307051f994060a085a417e (patch) | |
| tree | a1c7855c1b6b7c4b78cdc6f07505a4e039b30858 | |
| parent | ab5813bb20711a8e3493b152e50b3dda3aed5858 (diff) | |
smb: client: fix potential NULL deref in parse_dfs_referrals()
[ Upstream commit 92414333eb375ed64f4ae92d34d579e826936480 ]
If server returned no data for FSCTL_DFS_GET_REFERRALS, @dfs_rsp will
remain NULL and then parse_dfs_referrals() will dereference it.
Fix this by returning -EIO when no output data is returned.
Besides, we can't fix it in SMB2_ioctl() as some FSCTLs are allowed to
return no data as per MS-SMB2 2.2.32.
Fixes: 9d49640a21bf ("CIFS: implement get_dfs_refer for SMB2+")
Cc: stable@vger.kernel.org
Reported-by: Robert Morris <rtm@csail.mit.edu>
Signed-off-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | fs/cifs/smb2ops.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index ad9b207432e1..5fea15a5f341 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -2498,6 +2498,8 @@ smb2_get_dfs_refer(const unsigned int xid, struct cifs_ses *ses, (char **)&dfs_rsp, &dfs_rsp_size); } while (rc == -EAGAIN); + if (!rc && !dfs_rsp) + rc = -EIO; if (rc) { if ((rc != -ENOENT) && (rc != -EOPNOTSUPP)) cifs_tcon_dbg(VFS, "ioctl error in %s rc=%d\n", __func__, rc); |