From: Avihai Horon avihaih@nvidia.com
stable inclusion from stable-v5.10.94 commit 7c0d9c815ce87257e2eba1a346c27211e0867b81 bugzilla: https://gitee.com/openeuler/kernel/issues/I531X9
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit 20679094a0161c94faf77e373fa3f7428a8e14bd ]
Currently, when cma_resolve_ib_dev() searches for a matching GID it will stop searching after encountering the first empty GID table entry. This behavior is wrong since neither IB nor RoCE spec enforce tightly packed GID tables.
For example, when the matching valid GID entry exists at index N, and if a GID entry is empty at index N-1, cma_resolve_ib_dev() will fail to find the matching valid entry.
Fix it by making cma_resolve_ib_dev() continue searching even after encountering missing entries.
Fixes: f17df3b0dede ("RDMA/cma: Add support for AF_IB to rdma_resolve_addr()") Link: https://lore.kernel.org/r/b7346307e3bb396c43d67d924348c6c496493991.163905549... Signed-off-by: Avihai Horon avihaih@nvidia.com Reviewed-by: Mark Zhang markzhang@nvidia.com Signed-off-by: Leon Romanovsky leonro@nvidia.com Signed-off-by: Jason Gunthorpe jgg@nvidia.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com Acked-by: Xie XiuQi xiexiuqi@huawei.com --- drivers/infiniband/core/cma.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c index 8e54184566f7..4d4ba09f6cf9 100644 --- a/drivers/infiniband/core/cma.c +++ b/drivers/infiniband/core/cma.c @@ -775,6 +775,7 @@ static int cma_resolve_ib_dev(struct rdma_id_private *id_priv) unsigned int p; u16 pkey, index; enum ib_port_state port_state; + int ret; int i;
cma_dev = NULL; @@ -793,9 +794,14 @@ static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
if (ib_get_cached_port_state(cur_dev->device, p, &port_state)) continue; - for (i = 0; !rdma_query_gid(cur_dev->device, - p, i, &gid); - i++) { + + for (i = 0; i < cur_dev->device->port_data[p].immutable.gid_tbl_len; + ++i) { + ret = rdma_query_gid(cur_dev->device, p, i, + &gid); + if (ret) + continue; + if (!memcmp(&gid, dgid, sizeof(gid))) { cma_dev = cur_dev; sgid = gid;