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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: Antonio Ospite <ospite@studenti.unina.it> Cc: stable@kernel.org Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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@ -109,6 +109,12 @@ static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t
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int ret = 0;
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mutex_lock(&minors_lock);
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if (!hidraw_table[minor]) {
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ret = -ENODEV;
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goto out;
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}
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dev = hidraw_table[minor]->hid;
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if (!dev->hid_output_raw_report) {
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