Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-12-04 18:13:04 +00:00
Code Issues Packages Projects Releases Wiki Activity

staging/lustre/lnet: Fix use after free in ksocknal_send

Browse Source 
Call to ksocknal_launch_packet might schedule a callback that
might free the just sent message, and so subsequent access to it
via lntmsg->msg_vmflush goes to freed memory.

Instead we'll just remember if we are in the vmflush thread and
only restore if we happened to set mempressure flag.

Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Reviewed-on: http://review.whamcloud.com/8667
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4360
Reviewed-by: Liang Zhen <liang.zhen@intel.com>
Reviewed-by: Amir Shehata <amir.shehata@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oleg Drokin 2014-01-23 23:45:05 -05:00 committed by Greg Kroah-Hartman
parent 52481e4b00
commit aadbacc7f2
1 changed files with 3 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/staging/lustre/lnet/klnds/socklnd/socklnd_cb.c
View File

@ -924,7 +924,7 @@ ksocknal_launch_packet (lnet_ni_t *ni, ksock_tx_t *tx, lnet_process_id_t id)
int
ksocknal_send(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
{
int mpflag = 0;
int mpflag = 1;
int type = lntmsg->msg_type;
lnet_process_id_t target = lntmsg->msg_target;
unsigned int payload_niov = lntmsg->msg_niov;
@ -993,8 +993,9 @@ ksocknal_send(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
/* The first fragment will be set later in pro_pack */
rc = ksocknal_launch_packet(ni, tx, target);
if (lntmsg->msg_vmflush)
if (!mpflag)
cfs_memory_pressure_restore(mpflag);
if (rc == 0)
return (0);