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Bluetooth: hci_uart: fix GPF in h5_recv

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Syzbot hit general protection fault in h5_recv(). The problem was in
missing NULL check.

hu->serdev can be NULL and we cannot blindly pass &serdev->dev
somewhere, since it can cause GPF.

Fixes: d9dd833cf6 ("Bluetooth: hci_h5: Add runtime suspend")
Reported-and-tested-by: syzbot+7d41312fe3f123a6f605@syzkaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Pavel Skripkin 2021-09-02 23:27:56 +03:00 committed by Marcel Holtmann
parent 8bba13b1d0
commit 2fc7acb69f
1 changed files with 5 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/bluetooth/hci_h5.c
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@ -587,9 +587,11 @@ static int h5_recv(struct hci_uart *hu, const void *data, int count)
count -= processed;
}
pm_runtime_get(&hu->serdev->dev);
pm_runtime_mark_last_busy(&hu->serdev->dev);
pm_runtime_put_autosuspend(&hu->serdev->dev);
if (hu->serdev) {
pm_runtime_get(&hu->serdev->dev);
pm_runtime_mark_last_busy(&hu->serdev->dev);
pm_runtime_put_autosuspend(&hu->serdev->dev);
}
return 0;
}