Module: Mesa
Branch: master
Commit: 836c1c6fb10e308d353aa2ff50f239545c2daa27
URL:    
http://cgit.freedesktop.org/mesa/mesa/commit/?id=836c1c6fb10e308d353aa2ff50f239545c2daa27

Author: Alyssa Rosenzweig <[email protected]>
Date:   Wed Feb  3 14:11:44 2021 -0500

pan/bi: Fix NULL deref with empty shader

Fixes regression in dEQP-GLES31.functional.compute.basic.empty

Fixes: d0902aa2d4d ("pan/bi: Pass through wait_{6, 7} flags")
Signed-off-by: Alyssa Rosenzweig <[email protected]>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8848>

---

 src/panfrost/bifrost/bifrost_compile.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/panfrost/bifrost/bifrost_compile.c 
b/src/panfrost/bifrost/bifrost_compile.c
index 4177949076d..f54e1224ebe 100644
--- a/src/panfrost/bifrost/bifrost_compile.c
+++ b/src/panfrost/bifrost/bifrost_compile.c
@@ -2406,7 +2406,7 @@ bifrost_compile_shader_nir(void *mem_ctx, nir_shader *nir,
         pan_block *first_block = list_first_entry(&ctx->blocks, pan_block, 
link);
         bi_clause *first_clause = bi_next_clause(ctx, first_block, NULL);
 
-        unsigned first_deps = first_clause->dependencies;
+        unsigned first_deps = first_clause ? first_clause->dependencies : 0;
         program->wait_6 = (first_deps & (1 << 6));
         program->wait_7 = (first_deps & (1 << 7));
 

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