From e42dee9a99a3ecd32b5c027e8f7411fb5bc11eb6 Mon Sep 17 00:00:00 2001 From: Antonio Ospite Date: Tue, 5 Oct 2010 17:20:17 +0200 Subject: [PATCH] HID: hidraw, fix a NULL pointer dereference in hidraw_write BUG: unable to handle kernel NULL pointer dereference at 0000000000000028 IP: [] hidraw_write+0x3b/0x116 [hid] [...] This is reproducible by disconnecting the device while userspace writes to dev node in a loop and doesn't check return values in order to exit the loop. Signed-off-by: Antonio Ospite Cc: stable@kernel.org Signed-off-by: Jiri Kosina --- drivers/hid/hidraw.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c index 9eaf6ae5f97f..a3866b5c0c43 100644 --- a/drivers/hid/hidraw.c +++ b/drivers/hid/hidraw.c @@ -109,6 +109,12 @@ static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t int ret = 0; mutex_lock(&minors_lock); + + if (!hidraw_table[minor]) { + ret = -ENODEV; + goto out; + } + dev = hidraw_table[minor]->hid; if (!dev->hid_output_raw_report) {