tree fc81ea178fc4a885fecc476aaf47089923f2eeb8
parent 1f23b2d98c11fed43c552a5dbd00c793f81a8736
author Julia Lawall <julia@diku.dk> 1274963529 +0200
committer Greg Kroah-Hartman <gregkh@suse.de> 1275682579 -0700

USB: serial: digi_acceleport: Eliminate a NULL pointer dereference

If port is NULL, then the call to dev_err will dereference a value that is
a small offset from NULL.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@r exists@
expression E,E1;
identifier f;
statement S1,S2,S3;
@@

if ((E == NULL && ...) || ...)
{
  ... when != if (...) S1 else S2
      when != E = E1
* E->f
  ... when any
  return ...;
}
else S3
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>