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ksmbd: fix potential use-after-free in oplock/lease break ack

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commit 50f930db22 upstream.

If ksmbd_iov_pin_rsp return error, use-after-free can happen by
accessing opinfo->state and opinfo_put and ksmbd_fd_put could
called twice.

Reported-by: Ziyan Xu <research@securitygossip.com>
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>
This commit is contained in:
Namjae Jeon 2025-07-08 07:47:40 +09:00 committed by Greg Kroah-Hartman
parent 2d89dab1ea
commit 815f1161d6
1 changed files with 9 additions and 20 deletions
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29
fs/smb/server/smb2pdu.c
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@ -8517,11 +8517,6 @@ static void smb20_oplock_break_ack(struct ksmbd_work *work)
goto err_out;
}
opinfo->op_state = OPLOCK_STATE_NONE;
wake_up_interruptible_all(&opinfo->oplock_q);
opinfo_put(opinfo);
ksmbd_fd_put(work, fp);
rsp->StructureSize = cpu_to_le16(24);
rsp->OplockLevel = rsp_oplevel;
rsp->Reserved = 0;
@ -8529,16 +8524,15 @@ static void smb20_oplock_break_ack(struct ksmbd_work *work)
rsp->VolatileFid = volatile_id;
rsp->PersistentFid = persistent_id;
ret = ksmbd_iov_pin_rsp(work, rsp, sizeof(struct smb2_oplock_break));
if (!ret)
return;
if (ret) {
err_out:
smb2_set_err_rsp(work);
}
opinfo->op_state = OPLOCK_STATE_NONE;
wake_up_interruptible_all(&opinfo->oplock_q);
opinfo_put(opinfo);
ksmbd_fd_put(work, fp);
smb2_set_err_rsp(work);
}
static int check_lease_state(struct lease *lease, __le32 req_state)
@ -8668,11 +8662,6 @@ static void smb21_lease_break_ack(struct ksmbd_work *work)
}
lease_state = lease->state;
opinfo->op_state = OPLOCK_STATE_NONE;
wake_up_interruptible_all(&opinfo->oplock_q);
atomic_dec(&opinfo->breaking_cnt);
wake_up_interruptible_all(&opinfo->oplock_brk);
opinfo_put(opinfo);
rsp->StructureSize = cpu_to_le16(36);
rsp->Reserved = 0;
@ -8681,16 +8670,16 @@ static void smb21_lease_break_ack(struct ksmbd_work *work)
rsp->LeaseState = lease_state;
rsp->LeaseDuration = 0;
ret = ksmbd_iov_pin_rsp(work, rsp, sizeof(struct smb2_lease_ack));
if (!ret)
return;
if (ret) {
err_out:
smb2_set_err_rsp(work);
}
opinfo->op_state = OPLOCK_STATE_NONE;
wake_up_interruptible_all(&opinfo->oplock_q);
atomic_dec(&opinfo->breaking_cnt);
wake_up_interruptible_all(&opinfo->oplock_brk);
opinfo_put(opinfo);
smb2_set_err_rsp(work);
}
/**