From dc7237c6b7b529c5da2776cbb8b68cc74d1555c3 Mon Sep 17 00:00:00 2001 From: Antonio Ospite Date: Tue, 5 Oct 2010 17:20:16 +0200 Subject: HID: hidraw, fix a NULL pointer dereference in hidraw_ioctl commit d20d5ffab92f00188f360c44c791a5ffb988247c upstream. BUG: unable to handle kernel NULL pointer dereference at 0000000000000028 IP: [] hidraw_ioctl+0xfc/0x32c [hid] [...] This is reproducible by disconnecting the device while userspace does ioctl in a loop and doesn't check return values in order to exit the loop. Signed-off-by: Antonio Ospite Signed-off-by: Jiri Kosina Signed-off-by: Greg Kroah-Hartman --- drivers/hid/hidraw.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c index 3ccd4785067..f43e95e11d4 100644 --- a/drivers/hid/hidraw.c +++ b/drivers/hid/hidraw.c @@ -246,6 +246,10 @@ static long hidraw_ioctl(struct file *file, unsigned int cmd, mutex_lock(&minors_lock); dev = hidraw_table[minor]; + if (!dev) { + ret = -ENODEV; + goto out; + } switch (cmd) { case HIDIOCGRDESCSIZE: @@ -319,6 +323,7 @@ static long hidraw_ioctl(struct file *file, unsigned int cmd, ret = -ENOTTY; } +out: mutex_unlock(&minors_lock); return ret; } -- cgit v1.2.3-18-g5258