TILER: Fix NULL dereference when mapping kernel buffers with map_block

get_user_pages sets page to NULL for kernel allocated buffers, which
we dereferenced.  This patch fixes this.

Signed-off-by: Lajos Molnar <molnar@ti.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/media/video/tiler/tiler-main.c b/drivers/media/video/tiler/tiler-main.c
index 4d33d09fc73..5d72db1ca89 100644
--- a/drivers/media/video/tiler/tiler-main.c
+++ b/drivers/media/video/tiler/tiler-main.c
@@ -1066,7 +1066,7 @@ static s32 map_block(enum tiler_fmt fmt, u32 width, u32 height,
         tmp = mi->usr;
         for (i = 0; i < mi->num_pg; i++) {
                 if (get_user_pages(curr_task, mm, tmp, 1, write, 1, &page,
-                                                                        NULL)) {
+                                                                NULL) && page) {
                         if (page_count(page) < 1) {
                                 printk(KERN_ERR "Bad page count from"
                                                         "get_user_pages()\n");