CVE-2023-54038
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_conn: return ERR_PTR instead of NULL when there is no link hci_connect_sco currently returns NULL when there is no link (i.e. when hci_conn_link() returns NULL). sco_connect() expects an ERR_PTR in case of any error (see line 266 in sco.c). Thus, hcon set as NULL passes through to sco_conn_add(), which tries to get hcon->hdev, resulting in dereferencing a NULL pointer as reported by syzkaller. The same issue exists for iso_connect_cis() calling hci_connect_cis(). Thus, make hci_connect_sco() and hci_connect_cis() return ERR_PTR instead of NULL.
How to fix
- Linux Linux357ab53c83a5322437fa434e9a9e3e0bafe6b383, b4066eb04bb67e7ff66e5aaab0db4a753f37eaad, 6.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 06149746e7203d5ffe2d6faf9799ee36203aa8b8 ≤ v < 357ab53c83a5322437fa434e9a9e3e0bafe6b383, 06149746e7203d5ffe2d6faf9799ee36203aa8b8 ≤ v < b4066eb04bb67e7ff66e5aaab0db4a753f37eaad, f72fc94a17d45be98aecfd59c39b5b24a6a342e2, 6.3.8 ≤ v < 6.4, 6.4 | 357ab53c83a5322437fa434e9a9e3e0bafe6b383, b4066eb04bb67e7ff66e5aaab0db4a753f37eaad, 6.4 |
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