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RDMA/nes: Check for zero STag 

STags are generated randomly but the driver does not correctly prevent
a zero STag.  Using STag zero is privileged and causes a user space
application to fail.  This change prevents the driver from trying to
allocate a zero STag.

Signed-off-by: Faisal Latif <faisal.latif@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Faisal Latif 2009-12-09 15:54:23 -08:00 committed by Roland Dreier
parent 886f98a315
commit fd000e12a5
2 changed files with 2 additions and 4 deletions
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3
drivers/infiniband/hw/nes/nes_hw.c
View File

@ -437,11 +437,12 @@ struct nes_adapter *nes_init_adapter(struct nes_device *nesdev, u8 hw_rev) {
nesadapter->qp_table = (struct nes_qp **)(&nesadapter->allocated_arps[BITS_TO_LONGS(arp_table_size)]); nesadapter->qp_table = (struct nes_qp **)(&nesadapter->allocated_arps[BITS_TO_LONGS(arp_table_size)]);
/* mark the usual suspect QPs and CQs as in use */ /* mark the usual suspect QPs, MR and CQs as in use */
for (u32temp = 0; u32temp < NES_FIRST_QPN; u32temp++) { for (u32temp = 0; u32temp < NES_FIRST_QPN; u32temp++) {
set_bit(u32temp, nesadapter->allocated_qps); set_bit(u32temp, nesadapter->allocated_qps);
set_bit(u32temp, nesadapter->allocated_cqs); set_bit(u32temp, nesadapter->allocated_cqs);
} }
set_bit(0, nesadapter->allocated_mrs);
for (u32temp = 0; u32temp < 20; u32temp++) for (u32temp = 0; u32temp < 20; u32temp++)
set_bit(u32temp, nesadapter->allocated_pds); set_bit(u32temp, nesadapter->allocated_pds);

3
drivers/infiniband/hw/nes/nes_verbs.c
View File

@ -2503,9 +2503,6 @@ static struct ib_mr *nes_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
stag = stag_index << 8; stag = stag_index << 8;
stag |= driver_key; stag |= driver_key;
stag += (u32)stag_key; stag += (u32)stag_key;
if (stag == 0) {
stag = 1;
}
iova_start = virt; iova_start = virt;
/* Make the leaf PBL the root if only one PBL */ /* Make the leaf PBL the root if only one PBL */