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Fix buffer overrun in regexp matcher

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This commit is contained in:
Andreas Schwab
2013-01-29 14:45:15 +01:00
parent 7e2f0d2d77
commit a445af0bc7
5 changed files with 68 additions and 9 deletions
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16
posix/regexec.c
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@@ -197,7 +197,7 @@ static int group_nodes_into_DFAstates (const re_dfa_t *dfa,
static int check_node_accept (const re_match_context_t *mctx,
const re_token_t *node, int 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. */
@@ -1160,7 +1160,7 @@ check_matching (re_match_context_t *mctx, int fl_longest_match,
|| (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);
@@ -1738,7 +1738,7 @@ clean_state_log_if_needed (re_match_context_t *mctx, int next_state_log_idx)
&& 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;
}
@@ -2792,7 +2792,7 @@ get_subexp (re_match_context_t *mctx, int bkref_node, int bkref_str_idx)
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;
@@ -4102,7 +4102,7 @@ check_node_accept (const re_match_context_t *mctx, const re_token_t *node,
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;
@@ -4111,8 +4111,10 @@ extend_buffers (re_match_context_t *mctx)
if (BE (INT_MAX / 2 / sizeof (re_dfastate_t *) <= pstr->bufs_len, 0))
return REG_ESPACE;
/* Double the lengthes of the buffers. */
ret = re_string_realloc_buffers (pstr, MIN (pstr->len, pstr->bufs_len * 2));
/* Double the lengthes 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;