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* [PATCH][cifs-next] cifs: fix dereference on ses before it is null checked
@ 2019-09-02 15:01 Colin King
  0 siblings, 0 replies; only message in thread
From: Colin King @ 2019-09-02 15:01 UTC (permalink / raw)
  To: Steve French, linux-cifs, samba-technical; +Cc: kernel-janitors, linux-kernel

From: Colin Ian King <colin.king@canonical.com>

The assignment of pointer server dereferences pointer ses, however,
this dereference occurs before ses is null checked and hence we
have a potential null pointer dereference.  Fix this by only
dereferencing ses after it has been null checked.

Addresses-Coverity: ("Dereference before null check")
Fixes: 2808c6639104 ("cifs: add new debugging macro cifs_server_dbg")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 fs/cifs/transport.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 0d60bd2f4dca..a90bd4d75b4d 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -1242,12 +1242,13 @@ SendReceive(const unsigned int xid, struct cifs_ses *ses,
 	struct kvec iov = { .iov_base = in_buf, .iov_len = len };
 	struct smb_rqst rqst = { .rq_iov = &iov, .rq_nvec = 1 };
 	struct cifs_credits credits = { .value = 1, .instance = 0 };
-	struct TCP_Server_Info *server = ses->server;
+	struct TCP_Server_Info *server;
 
 	if (ses == NULL) {
 		cifs_dbg(VFS, "Null smb session\n");
 		return -EIO;
 	}
+	server = ses->server;
 	if (server == NULL) {
 		cifs_dbg(VFS, "Null tcp session\n");
 		return -EIO;
-- 
2.20.1


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2019-09-02 15:01 [PATCH][cifs-next] cifs: fix dereference on ses before it is null checked Colin King

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