[PATCH] smb2: fix uninitialized variable bug in smb2_ioctl_query_info

[PATCH] smb2: fix uninitialized variable bug in smb2_ioctl_query_info

[Gustavo A. R. Silva]

There is a potential execution path in which variable *resp_buftype*
is passed as an argument to function free_rsp_buf(), in which is used
without being properly initialized previously.

Fix this by initializing variable *resp_buftype* to -1 in order to
avoid unpredictable or unintended results.

Addresses-Coverity-ID: 1472116 ("Uninitialized scalar variable")
Fixes: 1473971 ("Uninitialized scalar variable")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
 fs/cifs/smb2ops.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index c6c6450d..927aadd 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -1133,7 +1133,7 @@ smb2_ioctl_query_info(const unsigned int xid,
 	struct smb_rqst rqst;
 	struct kvec iov[1];
 	struct kvec rsp_iov;
-	int resp_buftype;
+	int resp_buftype = -1;
 	struct smb2_query_info_rsp *rsp = NULL;
 	void *buffer;
 
-- 
2.7.4

Re: [PATCH] smb2: fix uninitialized variable bug in smb2_ioctl_query_info

[Gustavo A. R. Silva]

On 10/9/18 10:07 PM, Gustavo A. R. Silva wrote:
> There is a potential execution path in which variable *resp_buftype*
> is passed as an argument to function free_rsp_buf(), in which is used
> without being properly initialized previously.
> 
> Fix this by initializing variable *resp_buftype* to -1 in order to
> avoid unpredictable or unintended results.
> 
> Addresses-Coverity-ID: 1472116 ("Uninitialized scalar variable")
> Fixes: 1473971 ("Uninitialized scalar variable")

ugh... sorry, the line above is wrong... I'll send v2 shotly.

Thanks
--
Gustavo