gpu: nvgpu: fix use of untrusted scalar value

Kind value can be passed to API nvgpu_vm_map() from User
space (through IOCTL NVGPU_AS_IOCTL_MAP_BUFFER_EX)

But kind value is not checked for sane values
before storing it in bfr.kind_v
And then we use this kind value as array index
in gk20a_kind_is_supported() which is incorrect

Fix this by ensuring in nvgpu_vm_map() that the
kind value is well within range

Bug 200291879
Coverity id : 2567923
Coverity id : 2567924

Change-Id: Ic57395018727cbd2260c929581db256e427316c6
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/1496597
GVS: Gerrit_Virtual_Submit
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/kind_gk20a.h b/drivers/gpu/nvgpu/gk20a/kind_gk20a.h
index 9dec84a5..28d5802c 100644
--- a/drivers/gpu/nvgpu/gk20a/kind_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/kind_gk20a.h
@@ -27,6 +27,7 @@ void gk20a_init_uncompressed_kind_map(void);
 void gk20a_init_kind_attr(void);
 
 extern u16 gk20a_kind_attr[];
+#define NV_KIND_ATTR_SIZE               256
 #define NV_KIND_DEFAULT              -1
 
 #define GK20A_KIND_ATTR_SUPPORTED    BIT(0)