| From | Kamal Mostafa <> | Subject | [PATCH 3.13 131/212] iscsi-target: Change BUG_ON to REJECT in iscsit_process_nop_out | Date | Tue, 17 Jun 2014 14:43:45 -0700 |
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3.13.11.4 -stable review patch. If anyone has any objections, please let me know.
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From: Nicholas Bellinger <nab@linux-iscsi.org>
commit 7cbfcc953789ff864c2bf8365a82a3fba4869649 upstream.
This patch changes an incorrect use of BUG_ON to instead generate a REJECT + PROTOCOL_ERROR in iscsit_process_nop_out() code. This case can occur with traditional TCP where a flood of zeros in the data stream can reach this block for what is presumed to be a NOP-OUT with a solicited reply, but without a valid iscsi_cmd pointer.
This incorrect BUG_ON was introduced during the v3.11-rc timeframe with the following commit:
commit 778de368964c5b7e8100cde9f549992d521e9c89 Author: Nicholas Bellinger <nab@linux-iscsi.org> Date: Fri Jun 14 16:07:47 2013 -0700
iscsi/isert-target: Refactor ISCSI_OP_NOOP RX handling
Reported-by: Arshad Hussain <arshad.hussain@calsoftinc.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- drivers/target/iscsi/iscsi_target.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c index 55e5a03..9ab2b91 100644 --- a/drivers/target/iscsi/iscsi_target.c +++ b/drivers/target/iscsi/iscsi_target.c @@ -1564,7 +1564,9 @@ int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, * Initiator is expecting a NopIN ping reply.. */ if (hdr->itt != RESERVED_ITT) { - BUG_ON(!cmd); + if (!cmd) + return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, + (unsigned char *)hdr); spin_lock_bh(&conn->cmd_lock); list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); -- 1.9.1
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