diff options
Diffstat (limited to 'meta/recipes-support/libexif/files/CVE-2020-0198.patch')
-rw-r--r-- | meta/recipes-support/libexif/files/CVE-2020-0198.patch | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/meta/recipes-support/libexif/files/CVE-2020-0198.patch b/meta/recipes-support/libexif/files/CVE-2020-0198.patch new file mode 100644 index 0000000000..2a48844cb2 --- /dev/null +++ b/meta/recipes-support/libexif/files/CVE-2020-0198.patch | |||
@@ -0,0 +1,66 @@ | |||
1 | From ca71eda33fe8421f98fbe20eb4392473357c1c43 Mon Sep 17 00:00:00 2001 | ||
2 | From: Changqing Li <changqing.li@windriver.com> | ||
3 | Date: Wed, 30 Dec 2020 10:22:47 +0800 | ||
4 | Subject: [PATCH] fixed another unsigned integer overflow | ||
5 | |||
6 | first fixed by google in android fork, | ||
7 | https://android.googlesource.com/platform/external/libexif/+/1e187b62682ffab5003c702657d6d725b4278f16%5E%21/#F0 | ||
8 | |||
9 | (use a more generic overflow check method, also check second overflow instance.) | ||
10 | |||
11 | https://security-tracker.debian.org/tracker/CVE-2020-0198 | ||
12 | |||
13 | Upstream-Status: Backport[https://github.com/libexif/libexif/commit/ce03ad7ef4e8aeefce79192bf5b6f69fae396f0c] | ||
14 | CVE: CVE-2020-0198 | ||
15 | |||
16 | Signed-off-by: Changqing Li <changqing.li@windriver.com> | ||
17 | --- | ||
18 | libexif/exif-data.c | 10 ++++++---- | ||
19 | 1 file changed, 6 insertions(+), 4 deletions(-) | ||
20 | |||
21 | diff --git a/libexif/exif-data.c b/libexif/exif-data.c | ||
22 | index 8b280d3..34d58fc 100644 | ||
23 | --- a/libexif/exif-data.c | ||
24 | +++ b/libexif/exif-data.c | ||
25 | @@ -47,6 +47,8 @@ | ||
26 | #undef JPEG_MARKER_APP1 | ||
27 | #define JPEG_MARKER_APP1 0xe1 | ||
28 | |||
29 | +#define CHECKOVERFLOW(offset,datasize,structsize) (( offset >= datasize) || (structsize > datasize) || (offset > datasize - structsize )) | ||
30 | + | ||
31 | static const unsigned char ExifHeader[] = {0x45, 0x78, 0x69, 0x66, 0x00, 0x00}; | ||
32 | |||
33 | struct _ExifDataPrivate | ||
34 | @@ -327,7 +329,7 @@ exif_data_load_data_thumbnail (ExifData *data, const unsigned char *d, | ||
35 | exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData", "Bogus thumbnail offset (%u).", o); | ||
36 | return; | ||
37 | } | ||
38 | - if (s > ds - o) { | ||
39 | + if (CHECKOVERFLOW(o,ds,s)) { | ||
40 | exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData", "Bogus thumbnail size (%u), max would be %u.", s, ds-o); | ||
41 | return; | ||
42 | } | ||
43 | @@ -420,9 +422,9 @@ exif_data_load_data_content (ExifData *data, ExifIfd ifd, | ||
44 | } | ||
45 | |||
46 | /* Read the number of entries */ | ||
47 | - if ((offset + 2 < offset) || (offset + 2 < 2) || (offset + 2 > ds)) { | ||
48 | + if (CHECKOVERFLOW(offset, ds, 2)) { | ||
49 | exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData", | ||
50 | - "Tag data past end of buffer (%u > %u)", offset+2, ds); | ||
51 | + "Tag data past end of buffer (%u+2 > %u)", offset, ds); | ||
52 | return; | ||
53 | } | ||
54 | n = exif_get_short (d + offset, data->priv->order); | ||
55 | @@ -431,7 +433,7 @@ exif_data_load_data_content (ExifData *data, ExifIfd ifd, | ||
56 | offset += 2; | ||
57 | |||
58 | /* Check if we have enough data. */ | ||
59 | - if (offset + 12 * n > ds) { | ||
60 | + if (CHECKOVERFLOW(offset, ds, 12*n)) { | ||
61 | n = (ds - offset) / 12; | ||
62 | exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData", | ||
63 | "Short data; only loading %hu entries...", n); | ||
64 | -- | ||
65 | 2.17.1 | ||
66 | |||