Headline
CVE-2022-0413: patch 8.2.4253: using freed memory when substitute with function call · vim/vim@37f4795
Use After Free in GitHub repository vim/vim prior to 8.2.
@@ -3687,6 +3687,7 @@ 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; @@ -3980,11 +3981,20 @@ 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());
/* @@ -4790,6 +4800,7 @@ ex_substitute(exarg_T *eap) #endif
vim_regfree(regmatch.regprog); vim_free(sub_copy);
// Restore the flag values, they can be used for ":&&". subflags.do_all = save_do_all;
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