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[55/60] tcg/optimize: fix uninitialized variable

Message ID 20240301230619.661008-56-richard.henderson@linaro.org (mailing list archive)
State New, archived
Headers show
Series [01/60] linux-user/elfload: Disable core dump if getrlimit fails | expand

Commit Message

Richard Henderson March 1, 2024, 11:06 p.m. UTC 
From: Paolo Bonzini <pbonzini@redhat.com>

The variables uext_opc and sext_opc are used without initialization if
TCG_TARGET_extract_i{32,64}_valid returns false.  The result, depending
on the compiler, might be the generation of extract and sextract opcodes
with invalid offset and count, or just random data in the TCG opcode
stream.

Fixes: ceb9ee06b71 ("tcg/optimize: Handle TCG_COND_TST{EQ,NE}", 2024-02-03)
Cc: Richard Henderson <pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20240228110641.287205-1-pbonzini@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/optimize.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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Patch

diff --git a/tcg/optimize.c b/tcg/optimize.c
index 79e701652b..752cc5c56b 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -2102,7 +2102,8 @@  static bool fold_remainder(OptContext *ctx, TCGOp *op)
 
 static void fold_setcond_tst_pow2(OptContext *ctx, TCGOp *op, bool neg)
 {
-    TCGOpcode and_opc, sub_opc, xor_opc, neg_opc, shr_opc, uext_opc, sext_opc;
+    TCGOpcode and_opc, sub_opc, xor_opc, neg_opc, shr_opc;
+    TCGOpcode uext_opc = 0, sext_opc = 0;
     TCGCond cond = op->args[3];
     TCGArg ret, src1, src2;
     TCGOp *op2;