INTERCEPTOR(__sanitizer_FILE *, fopen, const char *path, const char *mode) {
void *ctx;
COMMON_INTERCEPTOR_ENTER(ctx, fopen, path, mode);
- COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
+ if (path) COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
COMMON_INTERCEPTOR_READ_RANGE(ctx, mode, REAL(strlen)(mode) + 1);
__sanitizer_FILE *res = REAL(fopen)(path, mode);
COMMON_INTERCEPTOR_FILE_OPEN(ctx, res, path);
--- /dev/null
+// Check that fopen(NULL, "r") is ok.
+// RUN: %clang -O2 %s -o %t && %run %t
+#include <stdio.h>
+const char *fn = NULL;
+FILE *f;
+int main() { f = fopen(fn, "r"); }