Fix leak of temporary buffer during exif tag reading

Author: nikic

ext/exif/exif.c

@@ -3588,9 +3588,11 @@ static int exif_process_IFD_TAG(image_info_type *ImageInfo, char *dir_entry, cha
 					Subdir_start = offset_base + php_ifd_get32u(value_ptr, ImageInfo->motorola_intel);
 					if (Subdir_start < offset_base || Subdir_start > offset_base+IFDlength) {
 						exif_error_docref("exif_read_data#error_ifd" EXIFERR_CC, ImageInfo, E_WARNING, "Illegal IFD Pointer");
+						EFREE_IF(outside);
 						return FALSE;
 					}
 					if (!exif_process_IFD_in_JPEG(ImageInfo, Subdir_start, offset_base, IFDlength, displacement, sub_section_index, tag)) {
+						EFREE_IF(outside);
 						return FALSE;
 					}
 #ifdef EXIF_DEBUG

ext/exif/tests/temporary_buffer_leak.jpg

@@ -0,0 +1,10 @@
+--TEST--
+OSS-Fuzz: Temporary buffer leak in tag reading
+--FILE--
+<?php
+
+var_dump(@exif_read_data(__DIR__ . '/temporary_buffer_leak.jpg'));
+
+?>
+--EXPECT--
+bool(false)