File php-CVE-2016-6291.patch of Package php7.6726

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File php-CVE-2016-6291.patch of Package php7.6726

X-Git-Url: http://72.52.91.13:8000/?p=php-src.git;a=blobdiff_plain;f=ext%2Fexif%2Fexif.c;h=760e7460c3ef9ff6b4ce6e0a76eedcf22ce0b517;hp=f366acc552b833af05c402be1c85c28cfd1581e6;hb=eebcbd5de38a0f1c2876035402cb770e37476519;hpb=3798eb6fd5dddb211b01d41495072fd9858d4e32

Index: php-7.0.7/ext/exif/exif.c
===================================================================
--- php-7.0.7.orig/ext/exif/exif.c	2016-08-03 10:10:37.409072745 +0200
+++ php-7.0.7/ext/exif/exif.c	2016-08-03 10:12:07.574573500 +0200
@@ -2728,6 +2728,12 @@ static int exif_process_IFD_in_MAKERNOTE
 		break;
 	}
 
+	if (maker_note->offset >= value_len) {
+		/* Do not go past the value end */
+		exif_error_docref("exif_read_data#error_ifd" EXIFERR_CC, ImageInfo, E_WARNING, "IFD data too short: 0x%04X offset 0x%04X", value_len, maker_note->offset);
+		return FALSE;
+	}
+
 	dir_start = value_ptr + maker_note->offset;
 
 #ifdef EXIF_DEBUG
@@ -2756,10 +2762,19 @@ static int exif_process_IFD_in_MAKERNOTE
 			offset_base = value_ptr;
 			break;
 		case MN_OFFSET_GUESS:
+			if (maker_note->offset + 10 + 4 >= value_len) {
+				/* Can not read dir_start+10 since it's beyond value end */
+				exif_error_docref("exif_read_data#error_ifd" EXIFERR_CC, ImageInfo, E_WARNING, "IFD data too short: 0x%04X", value_len);
+				return FALSE;
+			}
 			offset_diff = 2 + NumDirEntries*12 + 4 - php_ifd_get32u(dir_start+10, ImageInfo->motorola_intel);
 #ifdef EXIF_DEBUG
 			exif_error_docref(NULL EXIFERR_CC, ImageInfo, E_NOTICE, "Using automatic offset correction: 0x%04X", ((int)dir_start-(int)offset_base+maker_note->offset+displacement) + offset_diff);
 #endif
+			if (offset_diff < 0 || offset_diff >= value_len ) {
+				exif_error_docref("exif_read_data#error_ifd" EXIFERR_CC, ImageInfo, E_WARNING, "IFD data bad offset: 0x%04X length 0x%04X", offset_diff, value_len);
+				return FALSE;
+			}
 			offset_base = value_ptr + offset_diff;
 			break;
 		default:
@@ -2768,7 +2783,7 @@ static int exif_process_IFD_in_MAKERNOTE
 	}
 
 	if ((2+NumDirEntries*12) > value_len) {
-		exif_error_docref("exif_read_data#error_ifd" EXIFERR_CC, ImageInfo, E_WARNING, "Illegal IFD size: 2 + x%04X*12 = x%04X > x%04X", NumDirEntries, 2+NumDirEntries*12, value_len);
+		exif_error_docref("exif_read_data#error_ifd" EXIFERR_CC, ImageInfo, E_WARNING, "Illegal IFD size: 2 + 0x%04X*12 = 0x%04X > 0x%04X", NumDirEntries, 2+NumDirEntries*12, value_len);
 		return FALSE;
 	}
 
@@ -3054,7 +3069,10 @@ static int exif_process_IFD_TAG(image_in
 				break;
 
 			case TAG_MAKER_NOTE:
-				exif_process_IFD_in_MAKERNOTE(ImageInfo, value_ptr, byte_count, offset_base, IFDlength, displacement);
+				if (!exif_process_IFD_in_MAKERNOTE(ImageInfo, value_ptr, byte_count, offset_base, IFDlength, displacement)) {
+					EFREE_IF(outside);
+					return FALSE;
+				}
 				break;
 
 			case TAG_EXIF_IFD_POINTER:

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File php-CVE-2016-6291.patch of Package php7.6726

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