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URL: http://github.com/php/php-src/pull/21433/files

href="https://github.githubassets.com/assets/primer-primitives-6da842159062d25e.css" /> Fix GH-20964, GH-20927: fseek() stream seek with PHP_INT_MIN causes undefined behavior by iliaal · Pull Request #21433 · php/php-src · GitHub
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Fix GH-20964, GH-20927: fseek() stream seek with PHP_INT_MIN causes undefined behavior #21433

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Fix GH-20964, GH-20927: fseek() stream seek with PHP_INT_MIN causes undefined behavior #21433

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4 changes: 2 additions & 2 deletions ext/pdo_sqlite/pdo_sqlite.c
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Original file line number Diff line number Diff line change
Expand Up @@ -205,7 +205,7 @@ static int php_pdosqlite3_stream_seek(php_stream *stream, zend_off_t offset, int
switch(whence) {
case SEEK_CUR:
if (offset < 0) {
if (sqlite3_stream->position < (size_t)(-offset)) {
if (sqlite3_stream->position < -(size_t)offset) {
sqlite3_stream->position = 0;
*newoffs = -1;
return -1;
Expand Down Expand Up @@ -243,7 +243,7 @@ static int php_pdosqlite3_stream_seek(php_stream *stream, zend_off_t offset, int
sqlite3_stream->position = sqlite3_stream->size;
*newoffs = -1;
return -1;
} else if (sqlite3_stream->size < (size_t)(-offset)) {
} else if (sqlite3_stream->size < -(size_t)offset) {
sqlite3_stream->position = 0;
*newoffs = -1;
return -1;
Expand Down
23 changes: 23 additions & 0 deletions ext/pdo_sqlite/tests/gh20964.phpt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,23 @@
--TEST--
GH-20964 (fseek() on PDO SQLite blob stream with PHP_INT_MIN causes undefined behavior)
--EXTENSIONS--
pdo_sqlite
--FILE--
<?php
$db = new Pdo\Sqlite('sqlite::memory:');

$db->exec('CREATE TABLE test (id INTEGER PRIMARY KEY, data BLOB)');
$db->exec("INSERT INTO test (id, data) VALUES (1, 'hello')");

$stream = $db->openBlob('test', 'data', 1);

var_dump(fseek($stream, PHP_INT_MIN, SEEK_END));

rewind($stream);
var_dump(fseek($stream, PHP_INT_MIN, SEEK_CUR));

fclose($stream);
?>
--EXPECT--
int(-1)
int(-1)
4 changes: 2 additions & 2 deletions ext/sqlite3/sqlite3.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1131,7 +1131,7 @@ static int php_sqlite3_stream_seek(php_stream *stream, zend_off_t offset, int wh
switch(whence) {
case SEEK_CUR:
if (offset < 0) {
if (sqlite3_stream->position < (size_t)(-offset)) {
if (sqlite3_stream->position < -(size_t)offset) {
sqlite3_stream->position = 0;
*newoffs = -1;
return -1;
Expand Down Expand Up @@ -1172,7 +1172,7 @@ static int php_sqlite3_stream_seek(php_stream *stream, zend_off_t offset, int wh
sqlite3_stream->position = sqlite3_stream->size;
*newoffs = -1;
return -1;
} else if (sqlite3_stream->size < (size_t)(-offset)) {
} else if (sqlite3_stream->size < -(size_t)offset) {
sqlite3_stream->position = 0;
*newoffs = -1;
return -1;
Expand Down
24 changes: 24 additions & 0 deletions ext/sqlite3/tests/gh20964.phpt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,24 @@
--TEST--
GH-20964 (fseek() on SQLite3 blob stream with PHP_INT_MIN causes undefined behavior)
--EXTENSIONS--
sqlite3
--FILE--
<?php
require_once __DIR__ . '/new_db.inc';

$db->exec('CREATE TABLE test (id INTEGER PRIMARY KEY, data BLOB)');
$db->exec("INSERT INTO test (id, data) VALUES (1, 'hello')");

$stream = $db->openBlob('test', 'data', 1);

var_dump(fseek($stream, PHP_INT_MIN, SEEK_END));

rewind($stream);
var_dump(fseek($stream, PHP_INT_MIN, SEEK_CUR));

fclose($stream);
$db->close();
?>
--EXPECT--
int(-1)
int(-1)
4 changes: 2 additions & 2 deletions main/streams/memory.c
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Original file line number Diff line number Diff line change
Expand Up @@ -128,7 +128,7 @@ static int php_stream_memory_seek(php_stream *stream, zend_off_t offset, int whe
switch(whence) {
case SEEK_CUR:
if (offset < 0) {
if (ms->fpos < (size_t)(-offset)) {
if (ms->fpos < -(size_t)offset) {
ms->fpos = 0;
*newoffs = -1;
return -1;
Expand Down Expand Up @@ -165,7 +165,7 @@ static int php_stream_memory_seek(php_stream *stream, zend_off_t offset, int whe
stream->eof = 0;
stream->fatal_error = 0;
return 0;
} else if (ZSTR_LEN(ms->data) < (size_t)(-offset)) {
} else if (ZSTR_LEN(ms->data) < -(size_t)offset) {
ms->fpos = 0;
*newoffs = -1;
return -1;
Expand Down
22 changes: 22 additions & 0 deletions tests/basic/gh20964.phpt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,22 @@
--TEST--
GH-20964 (fseek() on php://memory with PHP_INT_MIN causes undefined behavior)
--FILE--
<?php
$stream = fopen('php://memory', 'r+');
fwrite($stream, 'hello');
rewind($stream);

var_dump(fseek($stream, PHP_INT_MIN, SEEK_END));
var_dump(ftell($stream));

rewind($stream);
var_dump(fseek($stream, PHP_INT_MIN, SEEK_CUR));
var_dump(ftell($stream));

fclose($stream);
?>
--EXPECT--
int(-1)
bool(false)
int(-1)
bool(false)
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