[PATCHv2 1/1] IB/srp: fix invalid indirect_sg_entries parameter value

Max Gurtovoy
2017-01-04T13:59:37Z

From: Israel Rukshin <israelr-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>

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.

Signed-off-by: Israel Rukshin <israelr-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Signed-off-by: Max Gurtovoy <maxg-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
---
drivers/infiniband/ulp/srp/ib_srp.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index 0f67cf9..79bf484 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -3699,6 +3699,12 @@ 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;
--
1.8.4.3