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| author | Ronnie Sahlberg <lsahlber@redhat.com> | 2017-09-08 10:37:35 +1000 |
|---|---|---|
| committer | Steve French <smfrench@gmail.com> | 2017-09-12 18:11:44 -0500 |
| commit | bf2afee14e07de16d3cafc67edbfc2a3cc65e4bc (patch) | |
| tree | aba3efa9b9ef3af8c4d233c6acddc47c07fcc946 | |
| parent | 52269718dc2cf2585d7a2828f31d46ef46e68000 (diff) | |
| download | linux-bf2afee14e07de16d3cafc67edbfc2a3cc65e4bc.tar.gz linux-bf2afee14e07de16d3cafc67edbfc2a3cc65e4bc.tar.bz2 linux-bf2afee14e07de16d3cafc67edbfc2a3cc65e4bc.zip | |
cifs: check rsp for NULL before dereferencing in SMB2_open
In SMB2_open there are several paths where the SendReceive2
call will return an error before it sets rsp_iov.iov_base
thus leaving iov_base uninitialized.
Thus we need to check rsp before we dereference it in
the call to get_rfc1002_length().
A report of this issue was previously reported in
http://www.spinics.net/lists/linux-cifs/msg12846.html
RH-bugzilla : 1476151
Version 2 :
* Lets properly initialize rsp_iov before we use it.
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>.
Signed-off-by: Steve French <smfrench@gmail.com>
Reported-by: Xiaoli Feng <xifeng@redhat.com>
CC: Stable <stable@vger.kernel.org>
| -rw-r--r-- | fs/cifs/smb2pdu.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index 5531e7ee1210..69a751b038ab 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -1634,7 +1634,7 @@ SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path, struct cifs_tcon *tcon = oparms->tcon; struct cifs_ses *ses = tcon->ses; struct kvec iov[4]; - struct kvec rsp_iov; + struct kvec rsp_iov = {NULL, 0}; int resp_buftype; int uni_path_len; __le16 *copy_path = NULL; @@ -1763,7 +1763,7 @@ SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path, if (rc != 0) { cifs_stats_fail_inc(tcon, SMB2_CREATE_HE); - if (err_buf) + if (err_buf && rsp) *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4, GFP_KERNEL); goto creat_exit; |