fix crash in regexec for nonzero nmatch argument with REG_NOSUB

[musl] / src / regex / regexec.c

diff --git a/src/regex/regexec.c b/src/regex/regexec.c
index 674c590..2e35b83 100644 (file)
--- a/src/regex/regexec.c
+++ b/src/regex/regexec.c
@@ -596,6 +596,7 @@ tre_tnfa_run_backtrack(const tre_tnfa_t *tnfa, const void *string,
      started from. */
   int next_c_start;
   const char *str_byte_start;
+  int pos_start = -1;
 #ifdef TRE_MBSTATE
   mbstate_t mbstate_start;
 #endif /* TRE_MBSTATE */
@@ -675,7 +676,9 @@ tre_tnfa_run_backtrack(const tre_tnfa_t *tnfa, const void *string,
   }
 
   state = NULL;
+  pos = pos_start;
   GET_NEXT_WCHAR();
+  pos_start = pos;
   next_c_start = next_c;
   str_byte_start = str_byte;
 #ifdef TRE_MBSTATE
@@ -980,6 +983,7 @@ regexec(const regex_t *restrict preg, const char *restrict string,
   tre_tnfa_t *tnfa = (void *)preg->TRE_REGEX_T_FIELD;
   reg_errcode_t status;
   int *tags = NULL, eo;
+  if (tnfa->cflags & REG_NOSUB) nmatch = 0;
   if (tnfa->num_tags > 0 && nmatch > 0)
     {
       tags = xmalloc(sizeof(*tags) * tnfa->num_tags);