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authorDavid Dillow <dillowda@ornl.gov>2008-04-16 21:01:12 -0700
committerRoland Dreier <rolandd@cisco.com>2008-04-16 21:01:12 -0700
commit1e89a1946cfd906d12eff437d2a76b3aa7f5e731 (patch)
tree2f48454d19bb6d6e07c5161d3307b68dc4978393 /drivers/infiniband/ulp/srp
parent826d801009fb3c82832f2d92149446cce354bf61 (diff)
IB/srp: Enforce protocol limit on srp_sg_tablesize
The current SRP initiator will allow unlimited s/g entries in the indirect descriptors lists, but the entry count field in the SRP_CMD request is 8 bits, so setting srp_sg_tablesize too large will open the possibility of wrapping the count and generating invalid requests. Clamp srp_sg_tablesize to the protocol limits to prevent surprises. Reported by Martin W. Schlining III <mschlining@datadirectnet.com>. Signed-off-by: David Dillow <dillowda@ornl.gov> Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband/ulp/srp')
-rw-r--r--drivers/infiniband/ulp/srp/ib_srp.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index fd4a49fc477..125765aa9d5 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -68,7 +68,7 @@ static int srp_max_iu_len;
module_param(srp_sg_tablesize, int, 0444);
MODULE_PARM_DESC(srp_sg_tablesize,
- "Max number of gather/scatter entries per I/O (default is 12)");
+ "Max number of gather/scatter entries per I/O (default is 12, max 255)");
static int topspin_workarounds = 1;
@@ -2138,6 +2138,11 @@ static int __init srp_init_module(void)
{
int ret;
+ if (srp_sg_tablesize > 255) {
+ printk(KERN_WARNING PFX "Clamping srp_sg_tablesize to 255\n");
+ srp_sg_tablesize = 255;
+ }
+
ib_srp_transport_template =
srp_attach_transport(&ib_srp_transport_functions);
if (!ib_srp_transport_template)