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| author | Gerd Rausch <gerd.rausch@oracle.com> | 2021-08-17 10:04:37 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-09-03 09:44:40 +0200 |
| commit | 706938b1d0e23da591cc999c902351229b1d8c97 (patch) | |
| tree | ecd50f97a6ce68bb2b680e8f8218a4897a51aac4 | |
| parent | f5b4eb81d780dc2010347d4266d25f3479bfded8 (diff) | |
| download | linux-stable-706938b1d0e23da591cc999c902351229b1d8c97.tar.gz linux-stable-706938b1d0e23da591cc999c902351229b1d8c97.tar.bz2 linux-stable-706938b1d0e23da591cc999c902351229b1d8c97.zip | |
net/rds: dma_map_sg is entitled to merge entries
[ Upstream commit fb4b1373dcab086d0619c29310f0466a0b2ceb8a ]
Function "dma_map_sg" is entitled to merge adjacent entries
and return a value smaller than what was passed as "nents".
Subsequently "ib_map_mr_sg" needs to work with this value ("sg_dma_len")
rather than the original "nents" parameter ("sg_len").
This old RDS bug was exposed and reliably causes kernel panics
(using RDMA operations "rds-stress -D") on x86_64 starting with:
commit c588072bba6b ("iommu/vt-d: Convert intel iommu driver to the iommu ops")
Simply put: Linux 5.11 and later.
Signed-off-by: Gerd Rausch <gerd.rausch@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Link: https://lore.kernel.org/r/60efc69f-1f35-529d-a7ef-da0549cad143@oracle.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | net/rds/ib_frmr.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/rds/ib_frmr.c b/net/rds/ib_frmr.c index 3d9c4c6397c3..20d045faf07c 100644 --- a/net/rds/ib_frmr.c +++ b/net/rds/ib_frmr.c @@ -112,9 +112,9 @@ static int rds_ib_post_reg_frmr(struct rds_ib_mr *ibmr) cpu_relax(); } - ret = ib_map_mr_sg_zbva(frmr->mr, ibmr->sg, ibmr->sg_len, + ret = ib_map_mr_sg_zbva(frmr->mr, ibmr->sg, ibmr->sg_dma_len, &off, PAGE_SIZE); - if (unlikely(ret != ibmr->sg_len)) + if (unlikely(ret != ibmr->sg_dma_len)) return ret < 0 ? ret : -EINVAL; /* Perform a WR for the fast_reg_mr. Each individual page |