73 lines
2.6 KiB
Diff
73 lines
2.6 KiB
Diff
# http://sourceware.org/bugzilla/show_bug.cgi?id=15078
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# CVE-2013-0242
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# ChangeLog, NEWS and new test removed to apply clean
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commit a445af0bc722d620afed7683cd320c0e4c7c6059
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Author: Andreas Schwab <schwab@suse.de>
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Date: Tue Jan 29 14:45:15 2013 +0100
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Fix buffer overrun in regexp matcher
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diff --git a/posix/regexec.c b/posix/regexec.c
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index 7f2de85..5ca2bf6 100644
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--- a/posix/regexec.c
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+++ b/posix/regexec.c
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@@ -197,7 +197,7 @@ static int group_nodes_into_DFAstates (const re_dfa_t *dfa,
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static int check_node_accept (const re_match_context_t *mctx,
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const re_token_t *node, int idx)
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internal_function;
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-static reg_errcode_t extend_buffers (re_match_context_t *mctx)
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+static reg_errcode_t extend_buffers (re_match_context_t *mctx, int min_len)
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internal_function;
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/* Entry point for POSIX code. */
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@@ -1160,7 +1160,7 @@ check_matching (re_match_context_t *mctx, int fl_longest_match,
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|| (BE (next_char_idx >= mctx->input.valid_len, 0)
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&& mctx->input.valid_len < mctx->input.len))
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{
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- err = extend_buffers (mctx);
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+ err = extend_buffers (mctx, next_char_idx + 1);
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if (BE (err != REG_NOERROR, 0))
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{
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assert (err == REG_ESPACE);
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@@ -1738,7 +1738,7 @@ clean_state_log_if_needed (re_match_context_t *mctx, int next_state_log_idx)
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&& mctx->input.valid_len < mctx->input.len))
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{
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reg_errcode_t err;
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- err = extend_buffers (mctx);
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+ err = extend_buffers (mctx, next_state_log_idx + 1);
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if (BE (err != REG_NOERROR, 0))
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return err;
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}
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@@ -2792,7 +2792,7 @@ get_subexp (re_match_context_t *mctx, int bkref_node, int bkref_str_idx)
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if (bkref_str_off >= mctx->input.len)
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break;
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- err = extend_buffers (mctx);
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+ err = extend_buffers (mctx, bkref_str_off + 1);
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if (BE (err != REG_NOERROR, 0))
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return err;
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@@ -4102,7 +4102,7 @@ check_node_accept (const re_match_context_t *mctx, const re_token_t *node,
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static reg_errcode_t
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internal_function __attribute_warn_unused_result__
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-extend_buffers (re_match_context_t *mctx)
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+extend_buffers (re_match_context_t *mctx, int min_len)
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{
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reg_errcode_t ret;
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re_string_t *pstr = &mctx->input;
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@@ -4111,8 +4111,10 @@ extend_buffers (re_match_context_t *mctx)
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if (BE (INT_MAX / 2 / sizeof (re_dfastate_t *) <= pstr->bufs_len, 0))
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return REG_ESPACE;
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- /* Double the lengthes of the buffers. */
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- ret = re_string_realloc_buffers (pstr, MIN (pstr->len, pstr->bufs_len * 2));
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+ /* Double the lengthes of the buffers, but allocate at least MIN_LEN. */
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+ ret = re_string_realloc_buffers (pstr,
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+ MAX (min_len,
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+ MIN (pstr->len, pstr->bufs_len * 2)));
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if (BE (ret != REG_NOERROR, 0))
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return ret;
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