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Fix GH-21986: PharData::getContent() crash on infinite recursion with… #21989

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Fix GH-21986: PharData::getContent() crash on infinite recursion with… #21989

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Fix GH-21986: PharData::getContent() crash on infinite recursion with…
devnexen May 8, 2026
d852b2f
add test
devnexen May 8, 2026
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Fix GH-21986: PharData::getContent() crash on infinite recursion with… 
… symlinks.

The entries being unbounded when cycling through them, it blows the
stack.
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@devnexen
devnexen committed May 8, 2026
commit 1300018550a6264614f81cbc7646fdae1bfc3762
30 changes: 20 additions & 10 deletions ext/phar/util.c
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Original file line number Diff line number Diff line change
Expand Up @@ -64,24 +64,34 @@ phar_entry_info *phar_get_link_source(phar_entry_info *entry) /* {{{ */
{
phar_entry_info *link_entry;
char *link;
uint32_t depth = 0, max_depth;

if (!entry->link) {
return entry;
}

link = phar_get_link_location(entry);
if (NULL != (link_entry = zend_hash_str_find_ptr(&(entry->phar->manifest), entry->link, strlen(entry->link))) ||
NULL != (link_entry = zend_hash_str_find_ptr(&(entry->phar->manifest), link, strlen(link)))) {
if (link != entry->link) {
efree(link);
max_depth = zend_hash_num_elements(&(entry->phar->manifest));

while (entry->link) {
if (UNEXPECTED(++depth > max_depth)) {
return NULL;
}
return phar_get_link_source(link_entry);
} else {
if (link != entry->link) {
efree(link);
link = phar_get_link_location(entry);

if (NULL != (link_entry = zend_hash_str_find_ptr(&(entry->phar->manifest), entry->link, strlen(entry->link))) ||
NULL != (link_entry = zend_hash_str_find_ptr(&(entry->phar->manifest), link, strlen(link)))) {
if (link != entry->link) {
efree(link);
}
entry = link_entry;
} else {
if (link != entry->link) {
efree(link);
}
return NULL;
}
return NULL;
}
return entry;
}
/* }}} */

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