From 907e1b3a22a8092461176af45468c5b1b9bf6cc0 Mon Sep 17 00:00:00 2001 From: jackey_1024 Date: Fri, 28 Oct 2022 09:45:08 +0800 Subject: [PATCH] busybox: fix use after free in bc module backport from upstream: https://git.busybox.net/busybox/commit/?id=41d5f800a14769704082f7faeabb8435285499be Signed-off-by: jackey_1024 --- miscutils/bc.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/miscutils/bc.c b/miscutils/bc.c index f9b08b0..4363585 100644 --- a/miscutils/bc.c +++ b/miscutils/bc.c @@ -2892,6 +2892,8 @@ static char peek_inbuf(void) ) { xc_read_line(&G.input_buffer, G.prs.lex_input_fp); G.prs.lex_inbuf = G.input_buffer.v; + // lex_next_at may point to now-freed data, update it: + G.prs.lex_next_at = G.prs.lex_inbuf; if (G.input_buffer.len <= 1) // on EOF, len is 1 (NUL byte) G.prs.lex_input_fp = NULL; } -- 2.25.1