3.18-stable review patch. If anyone has any objections, please let me know.
------------------
From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
[ 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@xxxxxxxxxxxxx>
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
[hans.verkuil@xxxxxxxxx: %ld -> %zd]
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/media/pci/cx25821/cx25821-core.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
--- 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 cx25
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 cx25
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;
