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ext/phar: add upper-bound check on LongLink entry size #22557

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ext/phar: add upper-bound check on LongLink entry size #22557

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2 changes: 2 additions & 0 deletions NEWS
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Original file line number Diff line number Diff line change
Expand Up @@ -81,6 +81,8 @@ PHP NEWS
PDOStatement::setFetchMode). (SakiTakamachi)

- Phar:
. Fixed bug GH-22556 (OOM DoS via oversized ././@LongLink entry in TAR phar).
(crystarm)
. Fixed bug GH-23418 (Use-after-free when looking up mounted directories).
(Weilin Du)
. Fixed bug GH-23477 (Memory leak on duplicate native Phar manifest entries).
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5 changes: 3 additions & 2 deletions ext/phar/tar.c
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Expand Up @@ -365,8 +365,9 @@ zend_result phar_parse_tarfile(php_stream* fp, char *fname, size_t fname_len, ch
/* support the ././@LongLink system for storing long filenames */
entry.filename_len = entry.uncompressed_filesize;

/* Check for overflow - bug 61065 */
if (entry.filename_len == UINT_MAX || entry.filename_len == 0) {
/* Check for empty or excessively large ././@LongLink filename entries - bug 61065 */
if (entry.filename_len == 0
|| entry.filename_len > UINT16_MAX) {
if (error) {
spprintf(error, 4096, "phar error: \"%s\" is a corrupted tar file (invalid entry size)", fname);
}
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