From d5be9df0679440bdca7412e2c303aca1f561696a Mon Sep 17 00:00:00 2001 From: Alice Michael Date: Fri, 26 Oct 2018 14:33:31 -0700 Subject: [PATCH] virtchnl: Fix off by one error [ Upstream commit 843faff87af261bf55eda719a06087af0486a168 ] When calculating the valid length for a VIRTCHNL_OP_ENABLE_CHANNELS message, we accidentally allowed messages with one extra virtchnl_channel_info structure on the end. This happened due to an off by one error, because we forgot that valid_len already accounted for one virtchnl_channel_info structure, so we need to subtract one from the num_tc value. Signed-off-by: Alice Michael Tested-by: Andrew Bowers Signed-off-by: Jeff Kirsher Signed-off-by: Sasha Levin --- include/linux/avf/virtchnl.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/include/linux/avf/virtchnl.h b/include/linux/avf/virtchnl.h index 212b3822d180..92d179fb6d59 100644 --- a/include/linux/avf/virtchnl.h +++ b/include/linux/avf/virtchnl.h @@ -798,8 +798,8 @@ virtchnl_vc_validate_vf_msg(struct virtchnl_version_info *ver, u32 v_opcode, if (msglen >= valid_len) { struct virtchnl_tc_info *vti = (struct virtchnl_tc_info *)msg; - valid_len += vti->num_tc * - sizeof(struct virtchnl_channel_info); + valid_len += (vti->num_tc - 1) * + sizeof(struct virtchnl_channel_info); if (vti->num_tc == 0) err_msg_format = true; }