This is a note to let you know that I've just added the patch titled
IB/srp: fix invalid indirect_sg_entries parameter value
to the 4.9-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-invalid-indirect_sg_entries-parameter-value.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0a475ef4226e305bdcffe12b401ca1eab06c4913 Mon Sep 17 00:00:00 2001
From: Israel Rukshin <israelr@xxxxxxxxxxxx>
Date: Wed, 4 Jan 2017 15:59:37 +0200
Subject: IB/srp: fix invalid indirect_sg_entries parameter value
From: Israel Rukshin <israelr@xxxxxxxxxxxx>
commit 0a475ef4226e305bdcffe12b401ca1eab06c4913 upstream.
After setting indirect_sg_entries module_param to huge value (e.g 500,000),
srp_alloc_req_data() fails to allocate indirect descriptors for the request
ring (kmalloc fails). This commit enforces the maximum value of
indirect_sg_entries to be SG_MAX_SEGMENTS as signified in module param
description.
Fixes: 65e8617fba17 (scsi: rename SCSI_MAX_{SG, SG_CHAIN}_SEGMENTS)
Fixes: c07d424d6118 (IB/srp: add support for indirect tables that don't fit in SRP_CMD)
Signed-off-by: Israel Rukshin <israelr@xxxxxxxxxxxx>
Signed-off-by: Max Gurtovoy <maxg@xxxxxxxxxxxx>
Reviewed-by: Laurence Oberman <loberman@xxxxxxxxxx>
Reviewed-by: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>--
Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -3683,6 +3683,12 @@ static int __init srp_init_module(void)
indirect_sg_entries = cmd_sg_entries;
}
+ if (indirect_sg_entries > SG_MAX_SEGMENTS) {
+ pr_warn("Clamping indirect_sg_entries to %u\n",
+ SG_MAX_SEGMENTS);
+ indirect_sg_entries = SG_MAX_SEGMENTS;
+ }
+
srp_remove_wq = create_workqueue("srp_remove");
if (!srp_remove_wq) {
ret = -ENOMEM;
Patches currently in stable-queue which might be from israelr@xxxxxxxxxxxx are
queue-4.9/ib-srp-fix-mr-allocation-when-the-device-supports-sg-gaps.patch
queue-4.9/ib-srp-fix-invalid-indirect_sg_entries-parameter-value.patch
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