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libxfont: Security Advisory - libxfont - CVE-2015-1803

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bdfReadCharacters: bailout if a char's bitmap cannot be read

Previously would charge on ahead with a NULL pointer in ci->bits, and
then crash later in FontCharInkMetrics() trying to access the bits.

(From OE-Core rev: 2c7a15a074501beb6b8a4c7bdf30604b1a432a6b)

Signed-off-by: Li Zhou <li.zhou@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Li Zhou
2015-04-27 10:49:22 +08:00
committed by Richard Purdie
parent 1abe1160da
commit 8f8858bfb0
2 changed files with 41 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
meta/recipes-graphics/xorg-lib/libxfont/0001-bdfReadCharacters-bailout-if-a-char-s-bitmap-cannot-.patch Normal file
View File

@@ -0,0 +1,40 @@
From 78c2e3d70d29698244f70164428bd2868c0ab34c Mon Sep 17 00:00:00 2001
From: Alan Coopersmith <alan.coopersmith@oracle.com>
Date: Fri, 6 Feb 2015 15:54:00 -0800
Subject: [PATCH] bdfReadCharacters: bailout if a char's bitmap cannot be read
[CVE-2015-1803]
Previously would charge on ahead with a NULL pointer in ci->bits, and
then crash later in FontCharInkMetrics() trying to access the bits.
Found with afl-1.23b.
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Julien Cristau <jcristau@debian.org>
Upstream-Status: backport
Signed-off-by: Li Zhou <li.zhou@windriver.com>
---
src/bitmap/bdfread.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/src/bitmap/bdfread.c b/src/bitmap/bdfread.c
index 6387908..1b29b81 100644
--- a/src/bitmap/bdfread.c
+++ b/src/bitmap/bdfread.c
@@ -458,7 +458,10 @@ bdfReadCharacters(FontFilePtr file, FontPtr pFont, bdfFileState *pState,
ci->metrics.descent = -bb;
ci->metrics.characterWidth = wx;
ci->bits = NULL;
- bdfReadBitmap(ci, file, bit, byte, glyph, scan, bitmapsSizes);
+ if (!bdfReadBitmap(ci, file, bit, byte, glyph, scan, bitmapsSizes)) {
+ bdfError("could not read bitmap for character '%s'\n", charName);
+ goto BAILOUT;
+ }
ci++;
ndx++;
} else
--
1.7.9.5

1
meta/recipes-graphics/xorg-lib/libxfont_1.5.0.bb
View File

@@ -19,6 +19,7 @@ XORG_PN = "libXfont"
BBCLASSEXTEND = "native"
SRC_URI += "file://0001-bdfReadProperties-property-count-needs-range-check-C.patch \
file://0001-bdfReadCharacters-bailout-if-a-char-s-bitmap-cannot-.patch \
"
SRC_URI[md5sum] = "664629bfa7cdf8b984155019fd395dcb"