From daa8454919de6c4e8b914c5d45276abd20baab08 Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Fri, 22 Jan 2010 10:52:38 -0800 Subject: regexec.c: avoid arithmetic overflow in buffer size calculation --- posix/regexec.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'posix') diff --git a/posix/regexec.c b/posix/regexec.c index c7d0b37ef5..3765d00ffd 100644 --- a/posix/regexec.c +++ b/posix/regexec.c @@ -3359,6 +3359,13 @@ build_trtable (const re_dfa_t *dfa, re_dfastate_t *state) if (BE (err != REG_NOERROR, 0)) goto out_free; + /* Avoid arithmetic overflow in size calculation. */ + if (BE ((((SIZE_MAX - (sizeof (re_node_set) + sizeof (bitset_t)) * SBC_MAX) + / (3 * sizeof (re_dfastate_t *))) + < ndests), + 0)) + goto out_free; + if (__libc_use_alloca ((sizeof (re_node_set) + sizeof (bitset_t)) * SBC_MAX + ndests * 3 * sizeof (re_dfastate_t *))) dest_states = (re_dfastate_t **) -- cgit v1.2.3