diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc b/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
--- a/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
@@ -7904,7 +7904,8 @@
   if (pattern)
     COMMON_INTERCEPTOR_READ_RANGE(ctx, pattern, internal_strlen(pattern) + 1);
   int res = REAL(regcomp)(preg, pattern, cflags);
-  COMMON_INTERCEPTOR_WRITE_RANGE(ctx, preg, struct_regex_sz);
+  if (preg)
+    COMMON_INTERCEPTOR_WRITE_RANGE(ctx, preg, struct_regex_sz);
   return res;
 }
 INTERCEPTOR(int, regexec, const void *preg, const char *string, SIZE_T nmatch,
diff --git a/compiler-rt/test/sanitizer_common/TestCases/Posix/regex.cpp b/compiler-rt/test/sanitizer_common/TestCases/Posix/regex.cpp
--- a/compiler-rt/test/sanitizer_common/TestCases/Posix/regex.cpp
+++ b/compiler-rt/test/sanitizer_common/TestCases/Posix/regex.cpp
@@ -42,32 +42,37 @@
 int main(void) {
   printf("regex\n");
 
-  regex_t regex;
-  int rv = regcomp(&regex, "[[:upp:]]", 0);
-  assert(rv);
+  {
+    regex_t regex;
+    int rv = regcomp(&regex, "[[:upper:]]\\([[:upper:]]\\)", 0);
+    assert(!rv);
 
-  char errbuf[1024];
-  regerror(rv, &regex, errbuf, sizeof errbuf);
-  printf("error: %s\n", errbuf);
+    test_matched(&regex, "abc");
+    test_matched(&regex, "ABC");
 
-  regfree(&regex);
+    test_print_matches(&regex, "ABC");
 
-  rv = regcomp(&regex, "[[:upper:]]\\([[:upper:]]\\)", 0);
-  assert(!rv);
+    regfree(&regex);
+  }
 
-  test_matched(&regex, "abc");
-  test_matched(&regex, "ABC");
+  {
+    regex_t regex;
+    int rv = regcomp(&regex, "[[:upp:]]", 0);
+    assert(rv);
 
-  test_print_matches(&regex, "ABC");
+    char errbuf[1024];
+    regerror(rv, &regex, errbuf, sizeof errbuf);
+    printf("error: %s\n", errbuf);
 
-  regfree(&regex);
+    regfree(&regex);
+  }
 
   // CHECK: regex
-  // CHECK: error:{{.*}}
   // CHECK: abc: not-matched
   // CHECK: ABC: matched
   // CHECK: matched[0]='AB'
   // CHECK: matched[1]='B'
+  // CHECK: error:{{.*}}
 
   return 0;
 }