bpo-41995: Fix null ptr deref in tracemalloc_copy_trace() (GH-22660)

miss-islington · Yunlongs · web-flow · commit afe86066e748 · 2020-10-13T00:09:08.000-07:00
Fix a null pointer dereference in tracemalloc_copy_trace() of _tracemalloc. (cherry picked from commit 66c28f5) Co-authored-by: Yunlongs <lylgood@foxmail.com>
diff --git a/Modules/_tracemalloc.c b/Modules/_tracemalloc.c
@@ -1199,7 +1199,7 @@ tracemalloc_copy_trace(_Py_hashtable_t *traces,
     trace_t *trace = (trace_t *)value;
 
     trace_t *trace2 = raw_malloc(sizeof(trace_t));
-    if (traces2 == NULL) {
+    if (trace2 == NULL) {
         return -1;
     }
     *trace2 = *trace;

Original file line number	Diff line number	Diff line change
`@@ -1199,7 +1199,7 @@ tracemalloc_copy_trace(_Py_hashtable_t *traces,`
`1199`	`1199`	`trace_t trace = (trace_t )value;`
`1200`	`1200`
`1201`	`1201`	`trace_t *trace2 = raw_malloc(sizeof(trace_t));`
`1202`		`- if (traces2 == NULL) {`
	`1202`	`+ if (trace2 == NULL) {`
`1203`	`1203`	`return -1;`
`1204`	`1204`	`}`
`1205`	`1205`	`trace2 = trace;`