CVE-2025-39841: scsi: lpfc: Fix buffer free/clear order in deferred receive path

CKI Backport Botrequested to merge
redhat/red-hat-ci-tools/kernel/bot-branches/centos-stream/src/kernel/centos-stream-9:backport-RHEL-119116-centos-stream-9-main into main

JIRA: https://issues.redhat.com/browse/RHEL-119116
CVE: CVE-2025-39841

commit 9dba9a45c348e8460da97c450cddf70b2056deb3
Author: John Evans <evans1210144@gmail.com>
Date:   Thu Aug 28 12:40:08 2025 +0800

    scsi: lpfc: Fix buffer free/clear order in deferred receive path
    
    Fix a use-after-free window by correcting the buffer release sequence in
    the deferred receive path. The code freed the RQ buffer first and only
    then cleared the context pointer under the lock. Concurrent paths (e.g.,
    ABTS and the repost path) also inspect and release the same pointer under
    the lock, so the old order could lead to double-free/UAF.
    
    Note that the repost path already uses the correct pattern: detach the
    pointer under the lock, then free it after dropping the lock. The
    deferred path should do the same.
    
    Fixes: 472e146d1cf3 ("scsi: lpfc: Correct upcalling nvmet_fc transport during io done downcall")
    Cc: stable@vger.kernel.org
    Signed-off-by: John Evans <evans1210144@gmail.com>
    Link: https://lore.kernel.org/r/20250828044008.743-1-evans1210144@gmail.com
    Reviewed-by: Justin Tee <justin.tee@broadcom.com>
    Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Signed-off-by: CKI Backport Bot cki-ci-bot+cki-gitlab-backport-bot@redhat.com

Created 2025-10-03 12:02 UTC by backporter - KWF FAQ - Slack #team-kernel-workflow - Source - Documentation - Report an issue

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