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[Embed][CORE] Validate the hexadecimal for hex2bin properly

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This commit is contained in:
Alexei Sorokin 2020-01-07 17:30:18 +03:00 committed by Diogo Peralta Cordeiro
parent ceeb6d4d8f
commit d467370efb
1 changed files with 1 additions and 3 deletions
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4
lib/media/mediafile.php
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@ -279,10 +279,8 @@ class MediaFile
$ret = preg_match('/^(.*-)?([^-]+)-[^-]+$/', $encoded_filename, $matches);
if ($ret === false) {
return false;
} elseif ($ret === 0) {
} elseif ($ret === 0 || !ctype_xdigit($matches[2])) {
return null; // No match
} elseif (strlen($matches[2]) % 2 !== 0) {
return null; // An odd length won't do for hex2bin
} else {
$filename = hex2bin($matches[2]);