Commit e42dee9a authored by Antonio Ospite's avatar Antonio Ospite Committed by Jiri Kosina

HID: hidraw, fix a NULL pointer dereference in hidraw_write

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: default avatarAntonio Ospite <ospite@studenti.unina.it>
Cc: stable@kernel.org
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent d20d5ffa
...@@ -109,6 +109,12 @@ static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t ...@@ -109,6 +109,12 @@ static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t
int ret = 0; int ret = 0;
mutex_lock(&minors_lock); mutex_lock(&minors_lock);
if (!hidraw_table[minor]) {
ret = -ENODEV;
goto out;
}
dev = hidraw_table[minor]->hid; dev = hidraw_table[minor]->hid;
if (!dev->hid_output_raw_report) { if (!dev->hid_output_raw_report) {
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment