From: Oleg Drokin Date: Fri, 24 Jan 2014 04:45:05 +0000 (-0500) Subject: staging/lustre/lnet: Fix use after free in ksocknal_send X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=aadbacc7f2f0f359bd562cb95adde3da348fb643;p=linux-beck.git staging/lustre/lnet: Fix use after free in ksocknal_send 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 Reviewed-on: http://review.whamcloud.com/8667 Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4360 Reviewed-by: Liang Zhen Reviewed-by: Amir Shehata Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/lustre/lnet/klnds/socklnd/socklnd_cb.c b/drivers/staging/lustre/lnet/klnds/socklnd/socklnd_cb.c index 68a4f52ec998..b7b53b579c85 100644 --- a/drivers/staging/lustre/lnet/klnds/socklnd/socklnd_cb.c +++ b/drivers/staging/lustre/lnet/klnds/socklnd/socklnd_cb.c @@ -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);