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author | Nikita Popov <nikic@php.net> | 2012-07-05 20:31:58 +0200 |
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committer | Nikita Popov <nikic@php.net> | 2012-07-05 20:41:54 +0200 |
commit | 157ddd95773114c1148536b4b32fcbedf0c79b20 (patch) | |
tree | 1a98388c9e0219156396e8d7871ecd444a3bf3d5 | |
parent | 88f46b162b3bf9bc9a7a1d3d7280f702f5b9f501 (diff) | |
download | php-git-157ddd95773114c1148536b4b32fcbedf0c79b20.tar.gz |
Fix potential integer overflow in nl2br
The buffer size was calculated manually, thus creating integer overflows
for very large inputs, e.g. nl2br(str_repeat("\n", 613566757)).
The code now uses safe_emalloc, thus making the code throw an error
instead of crashing.
-rw-r--r-- | ext/standard/string.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/ext/standard/string.c b/ext/standard/string.c index a521d78261..1a7bd1e0b4 100644 --- a/ext/standard/string.c +++ b/ext/standard/string.c @@ -4001,13 +4001,12 @@ PHP_FUNCTION(nl2br) RETURN_STRINGL(str, str_len, 1); } - if (is_xhtml) { - new_length = str_len + repl_cnt * (sizeof("<br />") - 1); - } else { - new_length = str_len + repl_cnt * (sizeof("<br>") - 1); - } + { + size_t repl_len = is_xhtml ? (sizeof("<br />") - 1) : (sizeof("<br>") - 1); - tmp = target = emalloc(new_length + 1); + new_length = str_len + repl_cnt * repl_len; + tmp = target = safe_emalloc(repl_cnt, repl_len, str_len + 1); + } while (str < end) { switch (*str) { |