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| author | Christian Beier <dontmind@freeshell.org> | 2010-01-07 18:58:49 +0100 |
|---|---|---|
| committer | Johannes Schindelin <johannes.schindelin@gmx.de> | 2010-01-07 18:58:49 +0100 |
| commit | 07008deea297c3e1183f0c9bdeb071b128ff4619 (patch) | |
| tree | 72f3c35e847d7fe8cac7cc0095a39574d1abd01f /libvncserver/font.c | |
| parent | 6220f13003a0d73d7659bd77fbe29abefa49969f (diff) | |
| download | libtdevnc-07008deea297c3e1183f0c9bdeb071b128ff4619.tar.gz libtdevnc-07008deea297c3e1183f0c9bdeb071b128ff4619.zip | |
libvncserver/font.c: add some checks to rfbDrawChar().
In some cases (bad font data) the coordinates evaluate to <0,
causing a segfault in the following memcpy().
[jes: keep the offset, but do not try to segfault]
Signed-off-by: Christian Beier <dontmind@freeshell.org>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Diffstat (limited to 'libvncserver/font.c')
| -rwxr-xr-x | libvncserver/font.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/libvncserver/font.c b/libvncserver/font.c index 8ba1020..a9091d2 100755 --- a/libvncserver/font.c +++ b/libvncserver/font.c @@ -24,7 +24,8 @@ int rfbDrawChar(rfbScreenInfoPtr rfbScreen,rfbFontDataPtr font, d=*data; data++; } - if(d&0x80) + if(d&0x80 && y+j >= 0 && y+j < rfbScreen->height && + x+i >= 0 && x+i < rfbScreen->width) memcpy(rfbScreen->frameBuffer+(y+j)*rowstride+(x+i)*bpp,colour,bpp); d<<=1; } |