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[PATCH] x86emul: deal with decode failure in predicates test


  • To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Jan Beulich <jbeulich@xxxxxxxx>
  • Date: Wed, 22 Nov 2023 08:26:54 +0100
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  • Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
  • Delivery-date: Wed, 22 Nov 2023 07:27:06 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

Don't let this end in SEGV, due to the subsequent NULL deref.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/tools/tests/x86_emulator/predicates.c
+++ b/tools/tests/x86_emulator/predicates.c
@@ -2189,6 +2189,13 @@ void do_test(uint8_t *instr, unsigned in
     {
         s = x86_decode_insn(ctxt, fetch);
 
+        if ( !s )
+        {
+            print_insn(instr, len);
+            printf(" failed to decode\n");
+            return;
+        }
+
         if ( x86_insn_length(s, ctxt) != len )
         {
             print_insn(instr, len);
@@ -2218,6 +2225,13 @@ void do_test(uint8_t *instr, unsigned in
 
         s = x86_decode_insn(ctxt, fetch);
 
+        if ( !s )
+        {
+            print_insn(instr, len);
+            printf(" failed to decode\n");
+            return;
+        }
+
         if ( x86_insn_length(s, ctxt) != len )
         {
             print_insn(instr, len);



 


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