Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: wifi: zd1211rw: Fix potential NULL pointer dereference in zd_mac_tx_to_dev() There is a potential NULL pointer dereference in zd_mac_tx_to_dev(). For example, the following is possible: T0 T1 zd_mac_tx_to_dev() /* len == skb_queue_len(q) */ while (len > ZD_MAC_MAX_ACK_WAITERS) { filter_ack() spin_lock_irqsave(&q->lock, flags); /* position == skb_queue_len(q) */ for (i=1; i<position; i++) skb = __skb_dequeue(q) if (mac->type == NL80211_IFTYPE_AP) skb = __skb_dequeue(q); spin_unlock_irqrestore(&q->lock, flags); skb_dequeue() -> NULL Since there is a small gap between checking skb queue length and skb being unconditionally dequeued in zd_mac_tx_to_dev(), skb_dequeue() can return NULL. Then the pointer is passed to zd_mac_tx_status() where it is dereferenced. In order to avoid potential NULL pointer dereference due to situations like above, check if skb is not NULL before passing it to zd_mac_tx_status(). Found by Linux Verification Center (linuxtesting.org) with SVACE.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 459c51ad6e1fc19e91a53798358433d3c08cd09d before c1958270de947604cc6de05fc96dbba256b49cf0; affected 459c51ad6e1fc19e91a53798358433d3c08cd09d before 014c34dc132015c4f918ada4982e952947ac1047; affected 459c51ad6e1fc19e91a53798358433d3c08cd09d before b24f65c184540dfb967479320ecf7e8c2e9220dc; affected 459c51ad6e1fc19e91a53798358433d3c08cd09d before adf08c96b963c7cd7ec1ee1c0c556228d9bedaae; affected 459c51ad6e1fc19e91a53798358433d3c08cd09d before 5420de65efbeb6503bcf1d43451c9df67ad60298; affected 459c51ad6e1fc19e91a53798358433d3c08cd09d before fcd9c923b58e86501450b9b442ccc7ce4a8d0fda; affected 459c51ad6e1fc19e91a53798358433d3c08cd09d before 602b4eb2f25668de15de69860ec99caf65b3684d; affected 459c51ad6e1fc19e91a53798358433d3c08cd09d before 74b1ec9f5d627d2bdd5e5b6f3f81c23317657023 |
| Linux / Linux | affected 2.6.25; unaffected 0 before 2.6.25; unaffected 5.4.296 through 5.4.*; unaffected 5.10.240 through 5.10.*; unaffected 5.15.189 through 5.15.*; unaffected 6.1.146 through 6.1.*; unaffected 6.6.99 through 6.6.*; unaffected 6.12.39 through 6.12.*; unaffected 6.15.7 through 6.15.*; unaffected 6.16 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/c1958270de947604cc6de05fc96dbba256b49cf0
- https://git.kernel.org/stable/c/014c34dc132015c4f918ada4982e952947ac1047
- https://git.kernel.org/stable/c/b24f65c184540dfb967479320ecf7e8c2e9220dc
- https://git.kernel.org/stable/c/adf08c96b963c7cd7ec1ee1c0c556228d9bedaae
- https://git.kernel.org/stable/c/5420de65efbeb6503bcf1d43451c9df67ad60298
- https://git.kernel.org/stable/c/fcd9c923b58e86501450b9b442ccc7ce4a8d0fda
- https://git.kernel.org/stable/c/602b4eb2f25668de15de69860ec99caf65b3684d
- https://git.kernel.org/stable/c/74b1ec9f5d627d2bdd5e5b6f3f81c23317657023
ADP enrichment
No English description supplied.