diff options
author | Colin Ian King <colin.king@canonical.com> | 2018-01-31 12:33:09 -0500 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-30 07:47:44 +0200 |
commit | 225f6c4c7a53fdbf4c3df1a9c0167b6159075fff (patch) | |
tree | aa477446b0dd387ed2bcef4cd308fd41fc06096f | |
parent | e9973931f57a8f8490d654124f26a95ba8ae78aa (diff) |
media: cx25821: prevent out-of-bounds read on array card
[ Upstream commit 67300abdbe9f1717532aaf4e037222762716d0f6 ]
Currently an out of range dev->nr is detected by just reporting the
issue and later on an out-of-bounds read on array card occurs because
of this. Fix this by checking the upper range of dev->nr with the size
of array card (removes the hard coded size), move this check earlier
and also exit with the error -ENOSYS to avoid the later out-of-bounds
array read.
Detected by CoverityScan, CID#711191 ("Out-of-bounds-read")
Fixes: commit 02b20b0b4cde ("V4L/DVB (12730): Add conexant cx25821 driver")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
[hans.verkuil@cisco.com: %ld -> %zd]
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | drivers/media/pci/cx25821/cx25821-core.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/media/pci/cx25821/cx25821-core.c b/drivers/media/pci/cx25821/cx25821-core.c index e81173c41e5a..34335ced002e 100644 --- a/drivers/media/pci/cx25821/cx25821-core.c +++ b/drivers/media/pci/cx25821/cx25821-core.c @@ -871,6 +871,10 @@ static int cx25821_dev_setup(struct cx25821_dev *dev) dev->nr = ++cx25821_devcount; sprintf(dev->name, "cx25821[%d]", dev->nr); + if (dev->nr >= ARRAY_SIZE(card)) { + CX25821_INFO("dev->nr >= %zd", ARRAY_SIZE(card)); + return -ENODEV; + } if (dev->pci->device != 0x8210) { pr_info("%s(): Exiting. Incorrect Hardware device = 0x%02x\n", __func__, dev->pci->device); @@ -887,9 +891,6 @@ static int cx25821_dev_setup(struct cx25821_dev *dev) dev->channels[i].sram_channels = &cx25821_sram_channels[i]; } - if (dev->nr > 1) - CX25821_INFO("dev->nr > 1!"); - /* board config */ dev->board = 1; /* card[dev->nr]; */ dev->_max_num_decoders = MAX_DECODERS; |