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authorPavan Kumar Linga <pavan.kumar.linga@intel.com>2023-12-16 02:48:07 +0300
committerTony Nguyen <anthony.l.nguyen@intel.com>2023-12-26 20:05:57 +0300
commita613fb464dc4d8902d1dbca836a0872a80d36296 (patch)
treeaeaa6f5fc35dc8e1b3ceb6b3d1a7cb22e2eb6b6e /drivers/net
parentfea7b71b8751a0bfa7fdf9977e5782f061f71589 (diff)
downloadlinux-a613fb464dc4d8902d1dbca836a0872a80d36296.tar.xz
idpf: avoid compiler introduced padding in virtchnl2_rss_key struct
Size of the virtchnl2_rss_key struct should be 7 bytes but the compiler introduces a padding byte for the structure alignment. This results in idpf sending an additional byte of memory to the device control plane than the expected buffer size. As the control plane enforces virtchnl message size checks to validate the message, set RSS key message fails resulting in the driver load failure. Remove implicit compiler padding by using "__packed" structure attribute for the virtchnl2_rss_key struct. Also there is no need to use __DECLARE_FLEX_ARRAY macro for the 'key_flex' struct field. So drop it. Fixes: 0d7502a9b4a7 ("virtchnl: add virtchnl version 2 ops") Reviewed-by: Larysa Zaremba <larysa.zaremba@intel.com> Signed-off-by: Pavan Kumar Linga <pavan.kumar.linga@intel.com> Reviewed-by: Simon Horman <horms@kernel.org> Tested-by: Scott Register <scott.register@intel.com> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/ethernet/intel/idpf/virtchnl2.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/net/ethernet/intel/idpf/virtchnl2.h b/drivers/net/ethernet/intel/idpf/virtchnl2.h
index 07e72c72d156..8dc837889723 100644
--- a/drivers/net/ethernet/intel/idpf/virtchnl2.h
+++ b/drivers/net/ethernet/intel/idpf/virtchnl2.h
@@ -1104,9 +1104,9 @@ struct virtchnl2_rss_key {
__le32 vport_id;
__le16 key_len;
u8 pad;
- __DECLARE_FLEX_ARRAY(u8, key_flex);
-};
-VIRTCHNL2_CHECK_STRUCT_LEN(8, virtchnl2_rss_key);
+ u8 key_flex[];
+} __packed;
+VIRTCHNL2_CHECK_STRUCT_LEN(7, virtchnl2_rss_key);
/**
* struct virtchnl2_queue_chunk - chunk of contiguous queues