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cups CVE-2011-3170
the patch come from:
http://cups.org/strfiles/3914/str3914.patch
The gif_read_lzw function in filter/image-gif.c in CUPS 1.4.8 and
earlier does not properly handle the first code word in an LZW stream,
which allows remote attackers to trigger a heap-based buffer overflow,
and possibly execute arbitrary code, via a crafted stream, a different
vulnerability than CVE-2011-2896.
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2011-3170
Integrated-by: Li Wang <li.wang@windriver.com>
---
filter/image-gif.c | 14 +++++++++-----
1 files changed, 9 insertions(+), 5 deletions(-)
diff --git a/filter/image-gif.c b/filter/image-gif.c
index 9542704..3857c21 100644
--- a/filter/image-gif.c
+++ b/filter/image-gif.c
@@ -654,11 +654,13 @@ gif_read_lzw(FILE *fp, /* I - File to read from */
if (code >= max_code)
{
- *sp++ = firstcode;
- code = oldcode;
+ if (sp < (stack + 8192))
+ *sp++ = firstcode;
+
+ code = oldcode;
}
- while (code >= clear_code)
+ while (code >= clear_code && sp < (stack + 8192))
{
*sp++ = table[1][code];
if (code == table[0][code])
@@ -667,8 +669,10 @@ gif_read_lzw(FILE *fp, /* I - File to read from */
code = table[0][code];
}
- *sp++ = firstcode = table[1][code];
- code = max_code;
+ if (sp < (stack + 8192))
+ *sp++ = firstcode = table[1][code];
+
+ code = max_code;
if (code < 4096)
{
--
1.7.0.5
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