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Filesystem API: Ensure wp_tempnam() does not produce file names longer than 255 characters as this is the limit on most filesystems.

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Props: costdev, doems, mikeschroder, oglekler, mrinal013.
Fixes: #35755.

git-svn-id: https://develop.svn.wordpress.org/trunk@56186 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Andrew Ozz
2023-07-10 20:31:35 +00:00
parent a92f7bf8cb
commit 8b8afa1299
2 changed files with 212 additions and 1 deletions
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src/wp-admin/includes/file.php
+19 -1
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@@ -689,7 +689,25 @@ function wp_tempnam( $filename = '', $dir = '' ) {
// Suffix some random data to avoid filename conflicts.
$temp_filename .= '-' . wp_generate_password( 6, false );
$temp_filename .= '.tmp';
$temp_filename = $dir . wp_unique_filename( $dir, $temp_filename );
$temp_filename = wp_unique_filename( $dir, $temp_filename );
/*
* Filesystems typically have a limit of 255 characters for a filename.
*
* If the generated unique filename exceeds this, truncate the initial
* filename and try again.
*
* As it's possible that the truncated filename may exist, producing a
* suffix of "-1" or "-10" which could exceed the limit again, truncate
* it to 252 instead.
*/
$characters_over_limit = strlen( $temp_filename ) - 252;
if ( $characters_over_limit > 0 ) {
$filename = substr( $filename, 0, -$characters_over_limit );
return wp_tempnam( $filename, $dir );
}
$temp_filename = $dir . $temp_filename;
$fp = @fopen( $temp_filename, 'x' );