CIFS kernel module bug

[Jeff Layton]

On Fri, 30 Sep 2011 14:58:58 +0100
Anton Altaparmakov <aia21 at cam.ac.uk> wrote:

> Hi,
> 
> Looking at the current kernel (in Linus' repository on github) there is a silly logic bug in the cifs module in fs/cifs/cifsfs.c::cifs_llseek() there is this bit of code:
> 
> 	/*
> 	 * origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
> 	 * the cached file length
> 	 */
> 	if (origin != SEEK_SET || origin != SEEK_CUR) {
> 
> The logical or should be a logical and, i.e. this should be:
> 
> 	if (origin != SEEK_SET && origin != SEEK_CUR) {
> 
> As the code is at present that line is ALWAYS true because origin is ALWAYS either != SEEK_SET or != SEEK_CUR as if it equals one it cannot equal the other and vice versa…
> 
> So at the moment it always does the revalidation instead of only for SEEK_END, SEEK_DATA, and SEEK_HOLE.
> 
> Best regards,
> 
> 	Anton


Haha, good catch. Care to roll up a patch to fix that?

-- 
Jeff Layton <jlayton at samba.org>