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From ca71eda33fe8421f98fbe20eb4392473357c1c43 Mon Sep 17 00:00:00 2001
From: Changqing Li <changqing.li@windriver.com>
Date: Wed, 30 Dec 2020 10:22:47 +0800
Subject: [PATCH] fixed another unsigned integer overflow
first fixed by google in android fork,
https://android.googlesource.com/platform/external/libexif/+/1e187b62682ffab5003c702657d6d725b4278f16%5E%21/#F0
(use a more generic overflow check method, also check second overflow instance.)
https://security-tracker.debian.org/tracker/CVE-2020-0198
Upstream-Status: Backport[https://github.com/libexif/libexif/commit/ce03ad7ef4e8aeefce79192bf5b6f69fae396f0c]
CVE: CVE-2020-0198
Signed-off-by: Changqing Li <changqing.li@windriver.com>
---
libexif/exif-data.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/libexif/exif-data.c b/libexif/exif-data.c
index 8b280d3..34d58fc 100644
--- a/libexif/exif-data.c
+++ b/libexif/exif-data.c
@@ -47,6 +47,8 @@
#undef JPEG_MARKER_APP1
#define JPEG_MARKER_APP1 0xe1
+#define CHECKOVERFLOW(offset,datasize,structsize) (( offset >= datasize) || (structsize > datasize) || (offset > datasize - structsize ))
+
static const unsigned char ExifHeader[] = {0x45, 0x78, 0x69, 0x66, 0x00, 0x00};
struct _ExifDataPrivate
@@ -327,7 +329,7 @@ exif_data_load_data_thumbnail (ExifData *data, const unsigned char *d,
exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData", "Bogus thumbnail offset (%u).", o);
return;
}
- if (s > ds - o) {
+ if (CHECKOVERFLOW(o,ds,s)) {
exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData", "Bogus thumbnail size (%u), max would be %u.", s, ds-o);
return;
}
@@ -420,9 +422,9 @@ exif_data_load_data_content (ExifData *data, ExifIfd ifd,
}
/* Read the number of entries */
- if ((offset + 2 < offset) || (offset + 2 < 2) || (offset + 2 > ds)) {
+ if (CHECKOVERFLOW(offset, ds, 2)) {
exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData",
- "Tag data past end of buffer (%u > %u)", offset+2, ds);
+ "Tag data past end of buffer (%u+2 > %u)", offset, ds);
return;
}
n = exif_get_short (d + offset, data->priv->order);
@@ -431,7 +433,7 @@ exif_data_load_data_content (ExifData *data, ExifIfd ifd,
offset += 2;
/* Check if we have enough data. */
- if (offset + 12 * n > ds) {
+ if (CHECKOVERFLOW(offset, ds, 12*n)) {
n = (ds - offset) / 12;
exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
"Short data; only loading %hu entries...", n);
--
2.17.1
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