path: root/net
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authorshamir rabinovitch <>2015-04-30 20:58:07 -0400
committerDavid S. Miller <>2015-05-03 23:39:01 -0400
commitc0adf54a10903b59037a4c5fcb933dfeeb7b2624 (patch)
tree5e8ec22f2eaab6b31b6371ea53c6da2b83cf0abf /net
parentedac450d5b5d47aa11e614f19c8f9b17f362e608 (diff)
net/rds: fix unaligned memory access
rdma_conn_param private data is copied using memcpy after headers such as cma_hdr (see cma_resolve_ib_udp as example). so the start of the private data is aligned to the end of the structure that come before. if this structure end with u32 the meaning is that the start of the private data will be 4 bytes aligned. structures that use u8/u16/u32/u64 are naturally aligned but in case the structure start is not 8 bytes aligned, all u64 members of this structure will not be aligned. to solve this issue we must use special macros that allow unaligned access to those unaligned members. Addresses the following kernel log seen when attempting to use RDMA: Kernel unaligned access at TPC[10507a88] rds_ib_cm_connect_complete+0x1bc/0x1e0 [rds_rdma] Acked-by: Chien Yen <> Signed-off-by: shamir rabinovitch <> [Minor tweaks for top of tree by:] Signed-off-by: David Ahern <> Signed-off-by: David S. Miller <>
Diffstat (limited to 'net')
1 files changed, 11 insertions, 2 deletions
diff --git a/net/rds/ib_cm.c b/net/rds/ib_cm.c
index 31b74f5e61ad..29144a60019f 100644
--- a/net/rds/ib_cm.c
+++ b/net/rds/ib_cm.c
@@ -183,8 +183,17 @@ void rds_ib_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_even
/* If the peer gave us the last packet it saw, process this as if
* we had received a regular ACK. */
- if (dp && dp->dp_ack_seq)
- rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
+ if (dp) {
+ /* dp structure start is not guaranteed to be 8 bytes aligned.
+ * Since dp_ack_seq is 64-bit extended load operations can be
+ * used so go through get_unaligned to avoid unaligned errors.
+ */
+ u64 dp_ack_seq = get_unaligned(&dp->dp_ack_seq);
+ if (dp_ack_seq)
+ rds_send_drop_acked(conn, be64_to_cpu(dp_ack_seq),
+ NULL);
+ }