vim/SOURCES/0001-patch-8.2.4253-using-freed-memory-when-substitute-wi.patch
2022-05-17 18:36:38 +00:00

70 lines
2.2 KiB
Diff

diff -up vim82/src/ex_cmds.c.cve0413 vim82/src/ex_cmds.c
--- vim82/src/ex_cmds.c.cve0413 2022-02-10 08:09:27.644493218 +0100
+++ vim82/src/ex_cmds.c 2022-02-10 08:09:27.653493168 +0100
@@ -3627,6 +3627,7 @@ ex_substitute(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;
@@ -3928,11 +3929,20 @@ ex_substitute(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, magic_isset());
/*
@@ -4737,6 +4747,7 @@ 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;
diff -up vim82/src/testdir/test_substitute.vim.cve0413 vim82/src/testdir/test_substitute.vim
--- vim82/src/testdir/test_substitute.vim.cve0413 2022-02-10 08:09:27.654493162 +0100
+++ vim82/src/testdir/test_substitute.vim 2022-02-10 08:10:14.392230843 +0100
@@ -926,4 +926,21 @@ func Test_substitute_multiline_submatch(
close!
endfunc
+" This was using "old_sub" after it was freed.
+func Test_using_old_sub()
+ set compatible maxfuncdepth=10
+ new
+ call setline(1, 'some text.')
+ func Repl()
+ ~
+ s/
+ endfunc
+ silent! s/\%')/\=Repl()
+
+ delfunc Repl
+ bwipe!
+ set nocompatible
+endfunc
+
+
" vim: shiftwidth=2 sts=2 expandtab