ksmbd: add chann_lock to protect ksmbd_chann_list xarray

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commit 4f3a06cc57 upstream.

ksmbd_chann_list xarray lacks synchronization, allowing use-after-free in
multi-channel sessions (between lookup_chann_list() and ksmbd_chann_del).

Adds rw_semaphore chann_lock to struct ksmbd_session and protects
all xa_load/xa_store/xa_erase accesses.

Cc: stable@vger.kernel.org
Reported-by: Igor Stepansky <igor.stepansky@orca.security>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Namjae Jeon 2026-02-09 10:43:19 +09:00 • committed by Greg Kroah-Hartman

parent 71b5e7c528

commit e4a8a96a93

3 changed files with 17 additions and 1 deletions

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5

fs/smb/server/mgmt/user_session.c

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1

fs/smb/server/mgmt/user_session.h

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12

fs/smb/server/smb2pdu.c

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