linux-kernel - [PATCH] cifs: fix the out of range assignment to bit fields in parse_server

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Date:   Mon, 12 Jul 2021 19:34:02 +0900
From:   Hyunchul Lee <hyc.lee@...il.com>
To:     Steve French <sfrench@...ba.org>
Cc:     kernel-team@....com, Namjae Jeon <linkinjeon@...nel.org>,
        linux-kernel@...r.kernel.org, linux-cifs@...r.kernel.org,
        samba-technical@...ts.samba.org
Subject: [PATCH] cifs: fix the out of range assignment to bit fields in parse_server_interfaces

Because the out of range assignment to bit fields
are compiler-dependant, the fields could have wrong
value.

Signed-off-by: Hyunchul Lee <hyc.lee@...il.com>
---
 fs/cifs/smb2ops.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index e4c8f603dd58..232d528df230 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -557,8 +557,8 @@ parse_server_interfaces(struct network_interface_info_ioctl_rsp *buf,
 	p = buf;
 	while (bytes_left >= sizeof(*p)) {
 		info->speed = le64_to_cpu(p->LinkSpeed);
-		info->rdma_capable = le32_to_cpu(p->Capability & RDMA_CAPABLE);
-		info->rss_capable = le32_to_cpu(p->Capability & RSS_CAPABLE);
+		info->rdma_capable = le32_to_cpu(p->Capability & RDMA_CAPABLE) ? 1 : 0;
+		info->rss_capable = le32_to_cpu(p->Capability & RSS_CAPABLE) ? 1 : 0;
 
 		cifs_dbg(FYI, "%s: adding iface %zu\n", __func__, *iface_count);
 		cifs_dbg(FYI, "%s: speed %zu bps\n", __func__, info->speed);
-- 
2.17.1