Mercurial > hg > octave-shane > gnulib-hg
diff lib/regexec.c @ 17304:d08258969ee9
regex: fix buffer overrun in regexp matcher
* lib/regexec.c (extend_buffers): Add parameter min_len.
(check_matching): Pass minimum needed length.
(clean_state_log_if_needed): Likewise.
(get_subexp): Likewise.
| author | Andreas Schwab <schwab@suse.de> |
|---|---|
| date | Tue, 29 Jan 2013 22:33:51 -0800 |
| parents | e542fd46ad6f |
| children | cd38818bce4e |
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--- a/lib/regexec.c +++ b/lib/regexec.c @@ -199,7 +199,7 @@ static bool check_node_accept (const re_match_context_t *mctx, const re_token_t *node, Idx idx) internal_function; -static reg_errcode_t extend_buffers (re_match_context_t *mctx) +static reg_errcode_t extend_buffers (re_match_context_t *mctx, int min_len) internal_function; /* Entry point for POSIX code. */ @@ -1176,7 +1176,7 @@ || (BE (next_char_idx >= mctx->input.valid_len, 0) && mctx->input.valid_len < mctx->input.len)) { - err = extend_buffers (mctx); + err = extend_buffers (mctx, next_char_idx + 1); if (BE (err != REG_NOERROR, 0)) { assert (err == REG_ESPACE); @@ -1756,7 +1756,7 @@ && mctx->input.valid_len < mctx->input.len)) { reg_errcode_t err; - err = extend_buffers (mctx); + err = extend_buffers (mctx, next_state_log_idx + 1); if (BE (err != REG_NOERROR, 0)) return err; } @@ -2813,7 +2813,7 @@ if (bkref_str_off >= mctx->input.len) break; - err = extend_buffers (mctx); + err = extend_buffers (mctx, bkref_str_off + 1); if (BE (err != REG_NOERROR, 0)) return err; @@ -4128,7 +4128,7 @@ static reg_errcode_t internal_function __attribute_warn_unused_result__ -extend_buffers (re_match_context_t *mctx) +extend_buffers (re_match_context_t *mctx, int min_len) { reg_errcode_t ret; re_string_t *pstr = &mctx->input; @@ -4138,8 +4138,10 @@ <= pstr->bufs_len, 0)) return REG_ESPACE; - /* Double the lengths of the buffers. */ - ret = re_string_realloc_buffers (pstr, MIN (pstr->len, pstr->bufs_len * 2)); + /* Double the lengths of the buffers, but allocate at least MIN_LEN. */ + ret = re_string_realloc_buffers (pstr, + MAX (min_len, + MIN (pstr->len, pstr->bufs_len * 2))); if (BE (ret != REG_NOERROR, 0)) return ret;