tgsi: fix coverity out-of-bounds warning

CID 1271532 (#1 of 1): Out-of-bounds read (OVERRUN)34. overrun-local:
Overrunning array of 2 16-byte elements at element index 2 (byte offset
32) by dereferencing pointer &inst.Dst[i].

Signed-off-by: Rob Clark <robclark@freedesktop.org>
Reviewed-by: Brian Paul <brianp@vmware.com>

diff --git a/src/gallium/auxiliary/tgsi/tgsi_text.c b/src/gallium/auxiliary/tgsi/tgsi_text.c
index 955d042..8bdec06 100644 (file)
--- a/src/gallium/auxiliary/tgsi/tgsi_text.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_text.c
@@ -1081,6 +1081,9 @@ parse_instruction(
       inst.Memory.Qualifier = 0;
    }
 
+   assume(info->num_dst <= TGSI_FULL_MAX_DST_REGISTERS);
+   assume(info->num_src <= TGSI_FULL_MAX_SRC_REGISTERS);
+
    /* Parse instruction operands.
     */
    for (i = 0; i < info->num_dst + info->num_src + info->is_tex; i++) {