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scsi: fnic: fix use after free

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[ Upstream commit ec990306f77fd4c58c3b27cc3b3c53032d6e6670 ]

The memory chunk io_req is released by mempool_free. Accessing
io_req->start_time will result in a use after free bug. The variable
start_time is a backup of the timestamp. So, use start_time here to
avoid use after free.

Link: https://lore.kernel.org/r/1572881182-37664-1-git-send-email-bianpan2016@163.com
Signed-off-by: Pan Bian <bianpan2016@163.com>
Reviewed-by: Satish Kharat <satishkh@cisco.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Pan Bian 2019-11-04 23:26:22 +08:00 committed by Greg Kroah-Hartman
parent 54a77a9cea
commit e12910cd45
1 changed files with 2 additions and 1 deletions
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3
drivers/scsi/fnic/fnic_scsi.c
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@ -1034,7 +1034,8 @@ static void fnic_fcpio_icmnd_cmpl_handler(struct fnic *fnic,
atomic64_inc(&fnic_stats->io_stats.io_completions);
io_duration_time = jiffies_to_msecs(jiffies) - jiffies_to_msecs(io_req->start_time);
io_duration_time = jiffies_to_msecs(jiffies) -
jiffies_to_msecs(start_time);
if(io_duration_time <= 10)
atomic64_inc(&fnic_stats->io_stats.io_btw_0_to_10_msec);