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| author | Dan Rosenberg <drosenberg@vsecurity.com> | 2010-09-15 18:44:22 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2010-09-27 22:22:11 -0300 |
| commit | 405707985594169cfd0b1d97d29fcb4b4c6f2ac9 (patch) | |
| tree | b6b33b07cdda4daf60d95783c4892877d4207af2 /drivers/media | |
| parent | fc00a1d90d7b64e44c2475833cc3021066f67ea7 (diff) | |
| download | blackbird-op-linux-405707985594169cfd0b1d97d29fcb4b4c6f2ac9.tar.gz blackbird-op-linux-405707985594169cfd0b1d97d29fcb4b4c6f2ac9.zip | |
V4L/DVB: ivtvfb: prevent reading uninitialized stack memory
The FBIOGET_VBLANK device ioctl allows unprivileged users to read 16
bytes of uninitialized stack memory, because the "reserved" member of
the fb_vblank struct declared on the stack is not altered or zeroed
before being copied back to the user. This patch takes care of it.
Signed-off-by: Dan Rosenberg <dan.j.rosenberg@gmail.com>
Signed-off-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/video/ivtv/ivtvfb.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/media/video/ivtv/ivtvfb.c b/drivers/media/video/ivtv/ivtvfb.c index be03a712731c..f0316d02f09f 100644 --- a/drivers/media/video/ivtv/ivtvfb.c +++ b/drivers/media/video/ivtv/ivtvfb.c @@ -466,6 +466,8 @@ static int ivtvfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long ar struct fb_vblank vblank; u32 trace; + memset(&vblank, 0, sizeof(struct fb_vblank)); + vblank.flags = FB_VBLANK_HAVE_COUNT |FB_VBLANK_HAVE_VCOUNT | FB_VBLANK_HAVE_VSYNC; trace = read_reg(IVTV_REG_DEC_LINE_FIELD) >> 16; |
