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authorBart Van Assche <bart.vanassche@wdc.com>2018-02-22 22:30:20 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2018-03-02 04:16:52 +0300
commit3be8828fc507cdafe7040a3dcf361a2bcd8e305b (patch)
tree2649155f701f97e4094d4943ca60750470f8d3a3 /include/scsi
parentfa83e65885b9147e2f2b89fdd4ecf7b4ff91571d (diff)
downloadlinux-3be8828fc507cdafe7040a3dcf361a2bcd8e305b.tar.xz
scsi: core: Avoid that ATA error handling can trigger a kernel hang or oops
Avoid that the recently introduced call_rcu() call in the SCSI core triggers a double call_rcu() call. Reported-by: Natanael Copa <ncopa@alpinelinux.org> Reported-by: Damien Le Moal <damien.lemoal@wdc.com> References: https://bugzilla.kernel.org/show_bug.cgi?id=198861 Fixes: 3bd6f43f5cb3 ("scsi: core: Ensure that the SCSI error handler gets woken up") Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com> Tested-by: Damien Le Moal <damien.lemoal@wdc.com> Cc: Natanael Copa <ncopa@alpinelinux.org> Cc: Damien Le Moal <damien.lemoal@wdc.com> Cc: Alexandre Oliva <oliva@gnu.org> Cc: Pavel Tikhomirov <ptikhomirov@virtuozzo.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Johannes Thumshirn <jthumshirn@suse.de> Cc: <stable@vger.kernel.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'include/scsi')
-rw-r--r--include/scsi/scsi_cmnd.h3
-rw-r--r--include/scsi/scsi_host.h2
2 files changed, 3 insertions, 2 deletions
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index 949a016dd7fa..0382ceab2eba 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -69,6 +69,9 @@ struct scsi_cmnd {
struct list_head list; /* scsi_cmnd participates in queue lists */
struct list_head eh_entry; /* entry for the host eh_cmd_q */
struct delayed_work abort_work;
+
+ struct rcu_head rcu;
+
int eh_eflags; /* Used by error handlr */
/*
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 1a1df0d21ee3..a8b7bf879ced 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -571,8 +571,6 @@ struct Scsi_Host {
struct blk_mq_tag_set tag_set;
};
- struct rcu_head rcu;
-
atomic_t host_busy; /* commands actually active on low-level */
atomic_t host_blocked;