commit 3ac1d97a1d9353490493d30088256360435f7731
author Bram Moolenaar <Bram@vim.org> Wed Jan 04 17:17:54 2023 +0000
committer Bram Moolenaar <Bram@vim.org> Wed Jan 04 17:17:54 2023 +0000
tree abb98762b33578fd248937ad21d1099e19a3e081
parent c32949b0779106ed5710ae3bffc5053e49083ab4

patch 9.0.1145: invalid memory access with recursive substitute expression

Problem:    Invalid memory access with recursive substitute expression.
Solution:   Check the return value of vim_regsub().

src/eval.c

diff --git a/src/eval.c b/src/eval.c
index 2fbd867..9ca8050 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -7312,6 +7312,11 @@
 	     * - The text after the match.
 	     */
 	    sublen = vim_regsub(&regmatch, sub, expr, tail, 0, REGSUB_MAGIC);
+	    if (sublen <= 0)
+	    {
+		ga_clear(&ga);
+		break;
+	    }
 	    if (ga_grow(&ga, (int)((end - tail) + sublen -
 			    (regmatch.endp[0] - regmatch.startp[0]))) == FAIL)
 	    {