nvmet: fix NULL pointer dereference in nvmet_execute_identify_nslist()

Overview

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

nvmet: fix NULL pointer dereference in nvmet_execute_identify_nslist()

When a host issues an Identify command with CNS 07h (Active Namespace ID List for a specific I/O Command Set), nvmet_execute_identify_nslist() is called with match_css set. The command-set filter dereferences req->ns, but this handler never calls nvmet_req_find_ns(), so req->ns is always NULL (nvmet_req_init() resets it to NULL). As soon as an enabled namespace with an NSID greater than the requested value exists, req->ns->csi dereferences a NULL pointer and oopses.

Besides the crash, the comparison is logically wrong: to filter the list by command set it must test the command set of the namespace being iterated, not a single fixed value. Use the loop variable ns->csi.

Affected

• Linux >= 61c9967cd63448292a64f9ee9aeb6e2053e3a624 < 61dc1a37e04d4003a19095f54883358330034a39
• Linux >= 61c9967cd63448292a64f9ee9aeb6e2053e3a624 < 2bc1e33ff6a558c8ceef7c0077f3ef70a15fcba2
• Linux >= 61c9967cd63448292a64f9ee9aeb6e2053e3a624 < 123d664ac98d6f3464462ad4a530474b91ba9890
• Linux >= 61c9967cd63448292a64f9ee9aeb6e2053e3a624 < 79aba4c9403419d822972d2851f2a96a2c0531cf
• Linux 6.13

Remediation

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