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authorJean Delvare <khali@linux-fr.org>2008-10-10 08:42:01 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2008-10-22 14:05:16 -0700
commit1a0afec2db3741b13bd39543822a0c110b50b133 (patch)
treedeba67426438aa7e978d563d503edd68d8c22e1e
parent18f0a7902f3557fce184053e00219f59b292f7df (diff)
V4L: bttv: Prevent NULL pointer dereference in radio_open
cherry picked from commit c37396c19403e249f12626187d51e92c915f2bc9 Fix the following crash in the bttv driver: BUG: unable to handle kernel NULL pointer dereference at 000000000000036c IP: [<ffffffffa037860a>] radio_open+0x3a/0x170 [bttv] This happens because radio_open assumes that all present bttv devices have a radio function. If a bttv device without radio and one with radio are installed on the same system, and the one without radio is registered first, then radio_open checks for the radio device number of a bttv device that has no radio function, and this breaks. All we have to do to fix it is to skip bttv devices without a radio function. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com> Signed-off-by: Michael Krufky <mkrufky@linuxtv.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/media/video/bt8xx/bttv-driver.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/media/video/bt8xx/bttv-driver.c b/drivers/media/video/bt8xx/bttv-driver.c
index 594522a155e6..b1cca43e4e6f 100644
--- a/drivers/media/video/bt8xx/bttv-driver.c
+++ b/drivers/media/video/bt8xx/bttv-driver.c
@@ -3422,7 +3422,7 @@ static int radio_open(struct inode *inode, struct file *file)
dprintk("bttv: open minor=%d\n",minor);
for (i = 0; i < bttv_num; i++) {
- if (bttvs[i].radio_dev->minor == minor) {
+ if (bttvs[i].radio_dev && bttvs[i].radio_dev->minor == minor) {
btv = &bttvs[i];
break;
}