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Backported for 5.6 from 7.1 by remi
without binary diff



From 5e824a88d073d282c4f358f186cb87ddc284f83d Mon Sep 17 00:00:00 2001
From: Stanislav Malyshev <stas@php.net>
Date: Fri, 1 Mar 2019 23:25:45 -0800
Subject: [PATCH] Fix integer overflows on 32-bits

---
 ext/exif/exif.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/ext/exif/exif.c b/ext/exif/exif.c
index cbde3effedf9..b4563927a505 100644
--- a/ext/exif/exif.c
+++ b/ext/exif/exif.c
@@ -3577,10 +3577,10 @@ static int exif_process_IFD_in_TIFF(image_info_type *ImageInfo, size_t dir_offse
 	tag_table_type tag_table = exif_get_tag_table(section_index);
 
 	if (ImageInfo->ifd_nesting_level > MAX_IFD_NESTING_LEVEL) {
-                return FALSE;
-        }
+		return FALSE;
+	}
 
-	if (ImageInfo->FileSize >= dir_offset+2) {
+	if (ImageInfo->FileSize >= 2 && ImageInfo->FileSize - 2 >= dir_offset) {
 		sn = exif_file_sections_add(ImageInfo, M_PSEUDO, 2, NULL);
 #ifdef EXIF_DEBUG
 		exif_error_docref(NULL EXIFERR_CC, ImageInfo, E_NOTICE, "Read from TIFF: filesize(x%04X), IFD dir(x%04X + x%04X)", ImageInfo->FileSize, dir_offset, 2);
@@ -3588,8 +3588,8 @@ static int exif_process_IFD_in_TIFF(image_info_type *ImageInfo, size_t dir_offse
 		php_stream_seek(ImageInfo->infile, dir_offset, SEEK_SET); /* we do not know the order of sections */
 		php_stream_read(ImageInfo->infile, (char*)ImageInfo->file.list[sn].data, 2);
 		num_entries = php_ifd_get16u(ImageInfo->file.list[sn].data, ImageInfo->motorola_intel);
-		dir_size = 2/*num dir entries*/ +12/*length of entry*/*num_entries +4/* offset to next ifd (points to thumbnail or NULL)*/;
-		if (ImageInfo->FileSize >= dir_offset+dir_size) {
+		dir_size = 2/*num dir entries*/ +12/*length of entry*/*(size_t)num_entries +4/* offset to next ifd (points to thumbnail or NULL)*/;
+		if (ImageInfo->FileSize >= dir_size && ImageInfo->FileSize - dir_size >= dir_offset) {
 #ifdef EXIF_DEBUG
 			exif_error_docref(NULL EXIFERR_CC, ImageInfo, E_NOTICE, "Read from TIFF: filesize(x%04X), IFD dir(x%04X + x%04X), IFD entries(%d)", ImageInfo->FileSize, dir_offset+2, dir_size-2, num_entries);
 #endif
@@ -3672,9 +3672,9 @@ static int exif_process_IFD_in_TIFF(image_info_type *ImageInfo, size_t dir_offse
 					}
 				}
 			}
-			if (ImageInfo->FileSize >= dir_offset + ImageInfo->file.list[sn].size) {
+			if (ImageInfo->FileSize >= ImageInfo->file.list[sn].size && ImageInfo->FileSize - ImageInfo->file.list[sn].size >= dir_offset) {
 				if (ifd_size > dir_size) {
-					if (dir_offset + ifd_size > ImageInfo->FileSize) {
+					if (ImageInfo->FileSize < ifd_size || dir_offset > ImageInfo->FileSize - ifd_size) {
 						exif_error_docref(NULL EXIFERR_CC, ImageInfo, E_WARNING, "Error in TIFF: filesize(x%04X) less than size of IFD(x%04X + x%04X)", ImageInfo->FileSize, dir_offset, ifd_size);
 						return FALSE;
 					}
From 5f0e62a3e5b525163e538aaab0161c2c8c5d057b 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 b4563927a505..ea88a8f115e8 100644
--- a/ext/exif/exif.c
+++ b/ext/exif/exif.c
@@ -3519,7 +3519,7 @@ 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
@@ -3540,6 +3540,10 @@ 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;
@@ -4183,7 +4187,9 @@ PHP_FUNCTION(exif_thumbnail)
 	ZVAL_STRINGL(return_value, ImageInfo.Thumbnail.data, ImageInfo.Thumbnail.size, 1);
 	if (arg_c >= 3) {
 		if (!ImageInfo.Thumbnail.width || !ImageInfo.Thumbnail.height) {
-			exif_scan_thumbnail(&ImageInfo TSRMLS_CC);
+			if (!exif_scan_thumbnail(&ImageInfo TSRMLS_CC)) {
+				ImageInfo.Thumbnail.width = ImageInfo.Thumbnail.height = 0;
+			}
 		}
 		zval_dtor(p_width);
 		zval_dtor(p_height);