smb: client: close handle after create-context parsing failure

Overview

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

smb: client: close handle after create-context parsing failure

SMB2_open() accounts a successful CREATE response as a remote open before parsing its create contexts. If smb2_parse_contexts() rejects malformed context data, SMB2_open() returns without closing the handle, leaving the server-side handle open and num_remote_opens elevated.

Close the handle after a post-CREATE context parsing failure so the error path releases the remote resource and balances the open count.

Affected

• Linux >= af1689a9b7701d9907dfc84d2a4b57c4bc907144 < 80c67cc71d32ccafc89a29b669243b40d81b930f
• Linux >= af1689a9b7701d9907dfc84d2a4b57c4bc907144 < f09875ff901e933e7b22c913daf51d21e9d93a45
• Linux >= af1689a9b7701d9907dfc84d2a4b57c4bc907144 < cdb36b09fb1f86d638d0afb44d621ed3f7c1d8eb
• Linux >= af1689a9b7701d9907dfc84d2a4b57c4bc907144 < 566820af017e81497fb5e9d3ad6e7ffe2828bc8b
• Linux 6726429c18c62dbf5e96ebbd522f262e016553fb
• Linux 13fb0fc4917621f3dfa285a27eaf7151d770b5e5
• Linux 890bc4fac3c0973a49cac35f634579bebba7fe48
• Linux 1ae3c59355dc9882e09c020afe8ffbd895ad0f29
• Linux 17a0f64cc02d4972e21c733d9f21d1c512963afa
• Linux >= 5.4.277 < 5.5
• Linux >= 5.10.211 < 5.11
• Linux >= 5.15.150 < 5.16
• Linux >= 6.1.79 < 6.2
• Linux >= 6.6.8 < 6.7
• Linux 6.7

Remediation

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