GH-142629: JIT: Fix out of bounds memory read in lltrace (GH-142821)

markshannon · web-flow · commit 92d4aeafd5c6 · 2025-12-16T19:57:15.000Z
JIT: Fix out of bounds memory read in lltrace
diff --git a/Python/optimizer.c b/Python/optimizer.c
@@ -356,7 +356,7 @@ _PyUOpPrint(const _PyUOpInstruction *uop)
         default:
             printf(" (%d, Unknown format)", uop->oparg);
     }
-    if (_PyUop_Flags[uop->opcode] & HAS_ERROR_FLAG) {
+    if (_PyUop_Flags[_PyUop_Uncached[uop->opcode]] & HAS_ERROR_FLAG) {
         printf(", error_target=%d", uop->error_target);
     }
 

Original file line number	Diff line number	Diff line change
`@@ -356,7 +356,7 @@ _PyUOpPrint(const _PyUOpInstruction *uop)`
`356`	`356`	`default:`
`357`	`357`	`printf(" (%d, Unknown format)", uop->oparg);`
`358`	`358`	`}`
`359`		`- if (_PyUop_Flags[uop->opcode] & HAS_ERROR_FLAG) {`
	`359`	`+ if (_PyUop_Flags[_PyUop_Uncached[uop->opcode]] & HAS_ERROR_FLAG) {`
`360`	`360`	`printf(", error_target=%d", uop->error_target);`
`361`	`361`	`}`
`362`	`362`