spi: Fix possible ZERO_SIZE_PTR pointer dereferencing error.

Since we cannot make sure the 'n' will always be none zero here, and
then if either equal to zero, the kzalloc() will return ZERO_SIZE_PTR,
which equals to ((void *)16).

So this patch fix this with just doing the zero check before calling
kzalloc().

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 0edccc82ece5..cc83cdd969ce 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -552,6 +552,9 @@ int spi_register_board_info(struct spi_board_info const *info, unsigned n)
         struct boardinfo *bi;
         int i;
 
+        if (!n)
+                return -EINVAL;
+
         bi = kzalloc(n * sizeof(*bi), GFP_KERNEL);
         if (!bi)
                 return -ENOMEM;