diff --git a/ChangeLog b/ChangeLog
index 2fef13ec02..e0e7a74011 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2018-12-15  Paul Eggert  <eggert@cs.ucla.edu>
+
+	regex: fix storage-exhaustion error
+	[BZ #18040]
+	* posix/regexec.c (get_subexp):
+	Do not continue if storage is exhausted.
+
 2018-12-15  Assaf Gordon  <assafgordon@gmail.com>
 
 	regex: fix heap-use-after-free error
diff --git a/posix/regexec.c b/posix/regexec.c
index a29e8ad1ff..ecb430d302 100644
--- a/posix/regexec.c
+++ b/posix/regexec.c
@@ -2786,6 +2786,8 @@ get_subexp (re_match_context_t *mctx, Idx bkref_node, Idx bkref_str_idx)
 	  buf = (const char *) re_string_get_buffer (&mctx->input);
 	  if (err == REG_NOMATCH)
 	    continue;
+	  if (__glibc_unlikely (err != REG_NOERROR))
+	    return err;
 	}
     }
   return REG_NOERROR;