+2013-01-29 Andreas Schwab <schwab@suse.de>
+
+ 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.
+
2013-01-28 Pádraig Brady <P@draigBrady.com>
mountlist: don't consider "devtmpfs" as dummy
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;
\f
/* Entry point for POSIX code. */
|| (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);
&& 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;
}
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;
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;
<= 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;