[lkml]   [2014]   [Jul]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH 3.14 26/59] IB/srp: Fix a sporadic crash triggered by cable pulling
3.14-stable review patch.  If anyone has any objections, please let me know.


From: Bart Van Assche <>

commit 024ca90151f5e4296d30f72c13ff9a075e23c9ec upstream.

Avoid that the loops that iterate over the request ring can encounter
a pointer to a SCSI command in req->scmnd that is no longer associated
with that request. If the function srp_unmap_data() is invoked twice
for a SCSI command that is not in flight then that would cause
ib_fmr_pool_unmap() to be invoked with an invalid pointer as argument,
resulting in a kernel oops.

Reported-by: Sagi Grimberg <>
Signed-off-by: Bart Van Assche <>
Reviewed-by: Sagi Grimberg <>
Signed-off-by: Roland Dreier <>
Signed-off-by: Greg Kroah-Hartman <>

drivers/infiniband/ulp/srp/ib_srp.c | 6 ++++++
1 file changed, 6 insertions(+)

--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -1576,6 +1576,12 @@ err_unmap:
srp_put_tx_iu(target, iu, SRP_IU_CMD);

+ /*
+ * Avoid that the loops that iterate over the request ring can
+ * encounter a dangling SCSI command pointer.
+ */
+ req->scmnd = NULL;
spin_lock_irqsave(&target->lock, flags);
list_add(&req->list, &target->free_reqs);

 \ /
  Last update: 2014-07-05 02:01    [W:0.253 / U:0.032 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site