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| author | Gustavo A. R. Silva <garsilva@embeddedor.com> | 2018-04-03 16:00:40 -0500 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2018-04-11 16:44:58 -0500 |
| commit | c0953f2ed510c31a375193e9dbca9774e77fb4b7 (patch) | |
| tree | 410692c8d7f7cb41cc10545daf6ec41537154489 | |
| parent | 8837c70d531a1788f975c366c254a5cb973a5291 (diff) | |
| download | linux-stable-c0953f2ed510c31a375193e9dbca9774e77fb4b7.tar.gz linux-stable-c0953f2ed510c31a375193e9dbca9774e77fb4b7.tar.bz2 linux-stable-c0953f2ed510c31a375193e9dbca9774e77fb4b7.zip | |
cifs: smb2pdu: Fix potential NULL pointer dereference
tcon->ses is being dereferenced before it is null checked, hence
there is a potential null pointer dereference.
Fix this by moving the pointer dereference after tcon->ses has
been properly null checked.
Addresses-Coverity-ID: 1467426 ("Dereference before null check")
Fixes: 93012bf98416 ("cifs: add server->vals->header_preamble_size")
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
| -rw-r--r-- | fs/cifs/smb2pdu.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index f7741cee2a4c..e5ac474d5d87 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -3454,7 +3454,7 @@ static int build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level, int outbuf_len, u64 persistent_fid, u64 volatile_fid) { - struct TCP_Server_Info *server = tcon->ses->server; + struct TCP_Server_Info *server; int rc; struct smb2_query_info_req *req; unsigned int total_len; @@ -3464,6 +3464,8 @@ build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level, if ((tcon->ses == NULL) || (tcon->ses->server == NULL)) return -EIO; + server = tcon->ses->server; + rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req, &total_len); if (rc) |