Bart Van Assche 46202aa823 isert: Fix null dereference in isert_cmnd allocation code ...

In a state where the list isert_conn->tx_free_list is empty
(mostly under traffic), we might fail to receive a command from
the isert command pool. This will result in later null deref.

In this case, busy-wait until a command will be available (will
be freed by the receive context).

[2158233.952087] BUG: unable to handle kernel NULL pointer dereference at (null)
[2158233.956023] IP: [<ffffffffa04e14d0>] isert_pdu_send+0xc0/0x1f0 [isert_scst]
....
[2158233.956023]  [<ffffffffa04d98c8>] ? isert_cmnd_alloc+0x78/0x110 [isert_scst]
[2158233.956023]  [<ffffffffa045b5a0>] req_cmnd_release+0x50/0x130 [iscsi_scst]
[2158233.956023]  [<ffffffffa04622cb>] iscsi_send_nop_in+0x19b/0x370 [iscsi_scst]

Signed-off-by: Ariel Nahum <arieln@mellanox.com>


git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@6554 d57e44dd-8a1f-0410-8b47-8ef2f437770f

2015-10-28 16:55:48 +00:00

..

isert-scst

isert: Fix null dereference in isert_cmnd allocation code

2015-10-28 16:55:48 +00:00

patches

RHEL 7.1: Add put_page_callback patch

2015-06-16 20:17:52 +00:00

config.c

iscsi-scst, isert-scst: One trace flags variable per kernel module

2015-06-23 15:01:17 +00:00

conn.c

Improve release logging

2015-08-25 02:57:51 +00:00

digest.c

iscsi-scst, isert-scst: One trace flags variable per kernel module

2015-06-23 15:01:17 +00:00

digest.h

Copyrights updated

2015-03-19 00:01:03 +00:00

event.c

iscsi-scst, isert-scst: One trace flags variable per kernel module

2015-06-23 15:01:17 +00:00

iscsi_dbg.h

Improve release logging

2015-08-25 02:57:51 +00:00

iscsi_hdr.h

Copyrights updated

2015-03-19 00:01:03 +00:00

iscsi_trace_flag.h

iscsi-scst, isert-scst: One trace flags variable per kernel module

2015-06-23 15:01:17 +00:00

iscsi.c

Improve release logging

2015-08-25 02:57:51 +00:00

iscsi.h

iscsi-scst: Move old TM response dropping to preparing new response stage

2015-07-31 01:09:58 +00:00

iscsit_transport.c

Cleanup

2015-08-25 02:56:08 +00:00

Kconfig

isert-scst: Fix in-tree build

2015-06-12 16:15:45 +00:00

Makefile

Merge iser branch r6234 into trunk

2015-06-10 15:35:26 +00:00

Makefile.in-kernel

isert-scst: Fix in-tree build

2015-06-12 16:15:45 +00:00

nthread.c

Improve release logging

2015-08-25 02:57:51 +00:00

param.c

iscsi-scst, isert-scst: One trace flags variable per kernel module

2015-06-23 15:01:17 +00:00

session.c

iscsi: Only use thread pool for TCP but not for iSER

2015-08-25 21:39:39 +00:00

target.c

Improve release logging

2015-08-25 02:57:51 +00:00