From 30d2b94a2e88021b77b07149e1f4438662ca8e5e Mon Sep 17 00:00:00 2001
From: Stanislav Malyshev <stas@php.net>
Date: Sat, 2 Mar 2019 13:38:00 -0800
Subject: [PATCH] Fix bug #77540 - Invalid Read on exif_process_SOFn

---
 ext/exif/exif.c              |  10 ++++++++--
 ext/exif/tests/bug77540.jpg  | Bin 0 -> 91 bytes
 ext/exif/tests/bug77540.phpt |  16 ++++++++++++++++
 3 files changed, 24 insertions(+), 2 deletions(-)
 create mode 100644 ext/exif/tests/bug77540.jpg
 create mode 100644 ext/exif/tests/bug77540.phpt

diff --git a/ext/exif/exif.c b/ext/exif/exif.c
index 4f2f660..8ed9c85 100644
--- a/ext/exif/exif.c
+++ b/ext/exif/exif.c
@@ -3902,7 +3902,7 @@ static int exif_scan_thumbnail(image_info_type *ImageInfo)
 			return FALSE;
 		marker = c;
 		length = php_jpg_get16(data+pos);
-		if (pos+length>=ImageInfo->Thumbnail.size) {
+		if (length > ImageInfo->Thumbnail.size || pos >= ImageInfo->Thumbnail.size - length) {
 			return FALSE;
 		}
 #ifdef EXIF_DEBUG
@@ -3923,6 +3923,10 @@ static int exif_scan_thumbnail(image_info_type *ImageInfo)
 			case M_SOF14:
 			case M_SOF15:
 				/* handle SOFn block */
+				if (length < 8 || ImageInfo->Thumbnail.size - 8 < pos) {
+					/* exif_process_SOFn needs 8 bytes */
+					return FALSE;
+				}
 				exif_process_SOFn(data+pos, marker, &sof_info);
 				ImageInfo->Thumbnail.height   = sof_info.height;
 				ImageInfo->Thumbnail.width    = sof_info.width;
@@ -4654,7 +4658,9 @@ PHP_FUNCTION(exif_thumbnail)
 	ZVAL_STRINGL(return_value, ImageInfo.Thumbnail.data, ImageInfo.Thumbnail.size);
 	if (arg_c >= 3) {
 		if (!ImageInfo.Thumbnail.width || !ImageInfo.Thumbnail.height) {
-			exif_scan_thumbnail(&ImageInfo);
+			if (!exif_scan_thumbnail(&ImageInfo)) {
+				ImageInfo.Thumbnail.width = ImageInfo.Thumbnail.height = 0;
+			}
 		}
 		zval_dtor(z_width);
 		zval_dtor(z_height);
-- 
diff --git a/ext/exif/tests/bug77540.phpt b/ext/exif/tests/bug77540.phpt
new file mode 100644
index 0000000..8702e0c
--- /dev/null
+++ b/ext/exif/tests/bug77540.phpt
@@ -0,0 +1,16 @@
+--TEST--
+Bug 77540 (Invalid Read on exif_process_SOFn)
+--SKIPIF--
+<?php if (!extension_loaded('exif')) print 'skip exif extension not available';?>
+--FILE--
+<?php
+$width = $height = 42;
+$s = exif_thumbnail(__DIR__."/bug77540.jpg", $width, $height);
+echo "Width ".$width."\n";
+echo "Height ".$height."\n";
+?>
+DONE
+--EXPECTF--
+Width 0
+Height 0
+DONE
-- 
2.1.4