This is a note to let you know that I've just added the patch titled
IB/srp: Fix srp_create_target() error handling
to the 4.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ib-srp-fix-srp_create_target-error-handling.patch
and it can be found in the queue-4.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f83b2561a6d4ff12959660ad597580097b744941 Mon Sep 17 00:00:00 2001
From: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
Date: Thu, 12 May 2016 10:48:48 -0700
Subject: IB/srp: Fix srp_create_target() error handling
From: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
commit f83b2561a6d4ff12959660ad597580097b744941 upstream.
Avoid that the following kernel oops occurs if memory pool
allocation fails:
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<ffffffffa048d0a0>] ib_drain_rq+0x0/0x20 [ib_core]
Call Trace:
[<ffffffffa04af386>] srp_create_target+0xca6/0x13a9 [ib_srp]
[<ffffffff813cc863>] dev_attr_store+0x13/0x20
[<ffffffff81214b50>] sysfs_kf_write+0x40/0x50
[<ffffffff81213f1c>] kernfs_fop_write+0x13c/0x180
[<ffffffff81197683>] __vfs_write+0x23/0xf0
[<ffffffff81198744>] vfs_write+0xa4/0x1a0
[<ffffffff81199a44>] SyS_write+0x44/0xa0
[<ffffffff8159e3e9>] entry_SYSCALL_64_fastpath+0x1c/0xac
Fixes: 1dc7b1f10dcb ("IB/srp: use the new CQ API")
Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
Reviewed-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
Tested-by: Laurence Oberman <loberman@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Sagi Grimberg <sagi@xxxxxxxxxxx>
Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/infiniband/ulp/srp/ib_srp.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -448,16 +448,16 @@ static struct srp_fr_pool *srp_alloc_fr_
/**
* srp_destroy_qp() - destroy an RDMA queue pair
- * @ch: SRP RDMA channel.
+ * @qp: RDMA queue pair.
*
* Drain the qp before destroying it. This avoids that the receive
* completion handler can access the queue pair while it is
* being destroyed.
*/
-static void srp_destroy_qp(struct srp_rdma_ch *ch)
+static void srp_destroy_qp(struct ib_qp *qp)
{
- ib_drain_rq(ch->qp);
- ib_destroy_qp(ch->qp);
+ ib_drain_rq(qp);
+ ib_destroy_qp(qp);
}
static int srp_create_ch_ib(struct srp_rdma_ch *ch)
@@ -530,7 +530,7 @@ static int srp_create_ch_ib(struct srp_r
}
if (ch->qp)
- srp_destroy_qp(ch);
+ srp_destroy_qp(ch->qp);
if (ch->recv_cq)
ib_free_cq(ch->recv_cq);
if (ch->send_cq)
@@ -554,7 +554,7 @@ static int srp_create_ch_ib(struct srp_r
return 0;
err_qp:
- srp_destroy_qp(ch);
+ srp_destroy_qp(qp);
err_send_cq:
ib_free_cq(send_cq);
@@ -597,7 +597,7 @@ static void srp_free_ch_ib(struct srp_ta
ib_destroy_fmr_pool(ch->fmr_pool);
}
- srp_destroy_qp(ch);
+ srp_destroy_qp(ch->qp);
ib_free_cq(ch->send_cq);
ib_free_cq(ch->recv_cq);
Patches currently in stable-queue which might be from bart.vanassche@xxxxxxxxxxx are
queue-4.6/ib-srp-fix-a-debug-kernel-crash.patch
queue-4.6/ib-srp-fix-srp_create_target-error-handling.patch
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