Description

In the Linux kernel, the following vulnerability has been resolved: net: usb: Remove disruptive netif_wake_queue in rtl8150_set_multicast syzbot reported WARNING in rtl8150_start_xmit/usb_submit_urb. This is the sequence of events that leads to the warning: rtl8150_start_xmit() { netif_stop_queue(); usb_submit_urb(dev->tx_urb); } rtl8150_set_multicast() { netif_stop_queue(); netif_wake_queue(); <-- wakes up TX queue before URB is done } rtl8150_start_xmit() { netif_stop_queue(); usb_submit_urb(dev->tx_urb); <-- double submission } rtl8150_set_multicast being the ndo_set_rx_mode callback should not be calling netif_stop_queue and notif_start_queue as these handle TX queue synchronization. The net core function dev_set_rx_mode handles the synchronization for rtl8150_set_multicast making it safe to remove these locks.

References 8

• git.kernel.org https://git.kernel.org/stable/c/114e05344763a102a8844efd96ec06ba99293ccd
• git.kernel.org https://git.kernel.org/stable/c/1a08a37ac03d07a1608a1592791041cac979fbc3
• git.kernel.org https://git.kernel.org/stable/c/54f8ef1a970a8376e5846ed90854decf7c00555d
• git.kernel.org https://git.kernel.org/stable/c/6053e47bbf212b93c051beb4261d7d5a409d0ce3
• git.kernel.org https://git.kernel.org/stable/c/6394bade9daab8e318c165fe43bba012bf13cd8e
• git.kernel.org https://git.kernel.org/stable/c/958baf5eaee394e5fd976979b0791a875f14a179
• git.kernel.org https://git.kernel.org/stable/c/9d72df7f5eac946f853bf49c428c4e87a17d91da
• git.kernel.org https://git.kernel.org/stable/c/cce3c0e21cdd15bcba5c35d3af1700186de8f187

Remediation