[PATCH] smb: client: avoid NULL resp_iov dereference

[Dan Carpenter]

On Mon, Sep 28, 2026 at 01:42:40PM +0800, Philip Li wrote:
> On Sun, Sep 27, 2026 at 05:54:30PM +0300, Dan Carpenter wrote:
> > On Sat, Sep 26, 2026 at 01:22:08PM +0000, Zihan Xi wrote:
> > > compound_send_recv() only populates response vectors when resp_iov is
> > > non-NULL. The final pre-authentication hash update nevertheless
> > > dereferences resp_iov[0] whenever all compound requests complete.
> > > 
> > > Guard the update with resp_iov to match the response-buffer handling and
> > > avoid a NULL pointer dereference on callers that do not request response
> > > vectors.
> > > 
> > > Fixes: 62432a3f5145 ("cifs: Clean up some places where an extra kvec[] was required for rfc1002")
> > > Cc: stable at vger.kernel.org
> > > Reported-by: kernel test robot <lkp at intel.com>
> > > Reported-by: Dan Carpenter <error27 at gmail.com>
> > > Closes: https://lore.kernel.org/all/202609241449.HlHmnZFZ-lkp@intel.com/
> > 
> > Originally the idea was that I would review these and filter out
> > the false positives, but these days people use lei to read email so
> > they recieve the unfiltered warnings.  The zero day bot should
> > probably put a "Unfiltered warning" note at the top to let people
> > know the warning hasn't been reviewed.
> 
> Got it, I will add this note to the bot report for unfiltered warnings.
> 

Thanks, Philip!

regards,
dan carpenter