From: Ian Romanick <ian.d.romanick@intel.com>
Date: Mon, 15 Jul 2019 22:18:47 +0000 (-0700)
Subject: nir/search: Fix possible NULL dereference in is_fsign
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=050e4e28bf7c86e2fc78b9e4dbaf285db1ed4b43;p=mesa.git

nir/search: Fix possible NULL dereference in is_fsign

Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
Fixes: 09705747d72 ("nir/algebraic: Reassociate fadd into fmul in DPH-like pattern")
---

diff --git a/src/compiler/nir/nir_search_helpers.h b/src/compiler/nir/nir_search_helpers.h
index a52104c7109..90ba897742d 100644
--- a/src/compiler/nir/nir_search_helpers.h
+++ b/src/compiler/nir/nir_search_helpers.h
@@ -209,7 +209,7 @@ is_fsign(nir_alu_instr *instr, unsigned src,
    if (src_alu->op == nir_op_fneg)
       src_alu = nir_src_as_alu_instr(src_alu->src[0].src);
 
-   return src_alu->op == nir_op_fsign;
+   return src_alu != NULL && src_alu->op == nir_op_fsign;
 }
 
 static inline bool