This data originates from userspace and is used in buffer offset
calculations which could potentially overflow causing an out-of-bounds
access.
Fixes: 8ce75f8ab904 ("drm/vmwgfx: Update device includes for DX device
functionality")
Reported-by: Rohit Keshri <[email protected]>
Signed-off-by: Ian Forbes <[email protected]>
---
drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
index b00818aaf94b..41a77dce99a2 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
@@ -3668,6 +3668,11 @@ static int vmw_cmd_check(struct vmw_private *dev_priv,
cmd_id = header->id;
+ if (header->size > SVGA_CMD_MAX_DATASIZE) {
+ VMW_DEBUG_USER("SVGA3D command: %d is too big.\n",
+ cmd_id + SVGA_3D_CMD_BASE);
+ return -E2BIG;
+ }
*size = header->size + sizeof(SVGA3dCmdHeader);
cmd_id -= SVGA_3D_CMD_BASE;
--
2.51.0
