2.6.32-stable review patch. If anyone has any objections, please let us know.
------------------ From: Antonio Ospite <[email protected]> commit e42dee9a99a3ecd32b5c027e8f7411fb5bc11eb6 upstream. BUG: unable to handle kernel NULL pointer dereference at 0000000000000028 IP: [<ffffffffa0f0a625>] 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 <[email protected]> Signed-off-by: Jiri Kosina <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/hid/hidraw.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) --- a/drivers/hid/hidraw.c +++ b/drivers/hid/hidraw.c @@ -105,11 +105,15 @@ out: static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) { unsigned int minor = iminor(file->f_path.dentry->d_inode); - /* FIXME: What stops hidraw_table going NULL */ - struct hid_device *dev = hidraw_table[minor]->hid; + struct hid_device *dev; __u8 *buf; int ret = 0; + if (!hidraw_table[minor]) + return -ENODEV; + + dev = hidraw_table[minor]->hid; + if (!dev->hid_output_raw_report) return -ENODEV; _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
