cxgb4/ch_ktls: disable softirqs around tid_list erases

Overview

In the Linux kernel, the following vulnerability has been resolved:

cxgb4/ch_ktls: disable softirqs around tid_list erases

chcr_ktls_cpl_act_open_rpl() inserts into tid_list from the receive path using xa_insert_bh(). The array is shared by the adapter's connections and initialized with XA_FLAGS_LOCK_BH. However, chcr_ktls_dev_del() and the chcr_ktls_dev_add() error path use xa_erase(), which takes the XArray lock without disabling softirqs.

When cleanup runs with softirqs enabled, a receive softirq for another connection on the same CPU can interrupt the erase and spin on the lock held by the interrupted task. Use xa_erase_bh() at both sites to match the insertion path.

Affected

• Linux >= 65e302a9bd57b62872040d57eea1201562a7cbb2 < 8739f06e3f82cd715f7dd10ab24029ed881efc90
• Linux >= 65e302a9bd57b62872040d57eea1201562a7cbb2 < bcf97573d44e277b1744d7f1226f665aa0ccc599
• Linux >= 65e302a9bd57b62872040d57eea1201562a7cbb2 < 7110c7f70c59eb7924e79853bcc00e2a026662e6
• Linux >= 65e302a9bd57b62872040d57eea1201562a7cbb2 < bea736a2b8c6da5b1078badf1206541b5404250f
• Linux >= 65e302a9bd57b62872040d57eea1201562a7cbb2 < 4c9dc0faca98084922caeb689579d338cf3e1c29
• Linux b96adbf6601d76ee0bdd9bfa5bcdd0cdd5333d78
• Linux 70c4ead897211b184f36cbeda213f2a3e8153218
• Linux >= 5.10.42 < 5.11
• Linux >= 5.12.9 < 5.13
• Linux 5.13

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.