lib/mpi: check for possible zero length
authorDmitry Kasatkin <dmitry.kasatkin@intel.com>
Thu, 26 Jan 2012 17:13:19 +0000 (19:13 +0200)
committerJames Morris <jmorris@namei.org>
Wed, 1 Feb 2012 13:23:39 +0000 (00:23 +1100)
Buggy client might pass zero nlimbs which is meaningless.
Added check for zero length.

Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
Reviewed-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>
lib/mpi/mpiutil.c

index 6bfc41f..26e4ed3 100644 (file)
@@ -58,6 +58,9 @@ mpi_ptr_t mpi_alloc_limb_space(unsigned nlimbs)
 {
        size_t len = nlimbs * sizeof(mpi_limb_t);
 
+       if (!len)
+               return NULL;
+
        return kmalloc(len, GFP_KERNEL);
 }