gpu: nvgpu: gm206: fix out of boundary memory access

Avoid out of bounds when searching bit header.

JIRA VFND-2826

Change-Id: Icbde7c7e04c35c29f316d8a0ad93c76fcb8fae7a
Signed-off-by: Richard Zhao <rizhao@nvidia.com>
Reviewed-on: http://git-master/r/1240185
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gm206/bios_gm206.c b/drivers/gpu/nvgpu/gm206/bios_gm206.c
index 2f1a32d3..033c84d6 100644
--- a/drivers/gpu/nvgpu/gm206/bios_gm206.c
+++ b/drivers/gpu/nvgpu/gm206/bios_gm206.c
@@ -882,7 +882,7 @@ static int gm206_bios_init(struct gk20a *g)
                 return err;
 
         gk20a_dbg_info("read bios");
-        for (i = 0; i < g->bios.size; i++) {
+        for (i = 0; i < g->bios.size - 6; i++) {
                 if (gm206_bios_rdu16(g, i) == BIT_HEADER_ID &&
                     gm206_bios_rdu32(g, i+2) ==  BIT_HEADER_SIGNATURE) {
                         gm206_bios_parse_bit(g, i);