vim/0001-patch-8.2.4253-using-freed-memory-when-substitute-wi.patch

52 lines
1.6 KiB
Diff

commit c604f3ad4782fde770617ff688e1ceac0dc1bd7c
Author: Tomas Korbar <tkorbar@redhat.com>
Date: Thu Feb 3 10:14:42 2022 +0100
Fix using freed memory when substitute with function call
diff --git a/src/ex_cmds.c b/src/ex_cmds.c
index e69fbd3..0788573 100644
--- a/src/ex_cmds.c
+++ b/src/ex_cmds.c
@@ -4767,6 +4767,7 @@ do_sub(exarg_T *eap)
int save_do_all; /* remember user specified 'g' flag */
int save_do_ask; /* remember user specified 'c' flag */
char_u *pat = NULL, *sub = NULL; /* init for GCC */
+ char_u *sub_copy = NULL;
int delimiter;
int sublen;
int got_quit = FALSE;
@@ -5062,11 +5063,20 @@ do_sub(exarg_T *eap)
sub_firstline = NULL;
/*
- * ~ in the substitute pattern is replaced with the old pattern.
- * We do it here once to avoid it to be replaced over and over again.
- * But don't do it when it starts with "\=", then it's an expression.
+ * If the substitute pattern starts with "\=" then it's an expression.
+ * Make a copy, a recursive function may free it.
+ * Otherwise, '~' in the substitute pattern is replaced with the old
+ * pattern. We do it here once to avoid it to be replaced over and over
+ * again.
*/
- if (!(sub[0] == '\\' && sub[1] == '='))
+ if (sub[0] == '\\' && sub[1] == '=')
+ {
+ sub = vim_strsave(sub);
+ if (sub == NULL)
+ return;
+ sub_copy = sub;
+ }
+ else
sub = regtilde(sub, p_magic);
/*
@@ -5825,6 +5835,7 @@ outofmem:
#endif
vim_regfree(regmatch.regprog);
+ vim_free(sub_copy);
/* Restore the flag values, they can be used for ":&&". */
subflags.do_all = save_do_all;