linux-kernel - [PATCH 4.4 46/91] uapi glibc compat: fix outer guard of net device flags enum

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Message-Id: <20200401161529.353085103@linuxfoundation.org>
Date:   Wed,  1 Apr 2020 18:17:42 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jonas Gorski <jonas.gorski@...il.com>,
        Mikko Rapeli <mikko.rapeli@....fi>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 46/91] uapi glibc compat: fix outer guard of net device flags enum

From: Jonas Gorski <jonas.gorski@...il.com>

[ Upstream commit efc45154828ae4e49c6b46f59882bfef32697d44 ]

Fix a wrong condition preventing the higher net device flags
IFF_LOWER_UP etc to be defined if net/if.h is included before
linux/if.h.

The comment makes it clear the intention was to allow partial
definition with either parts.

This fixes compilation of userspace programs trying to use
IFF_LOWER_UP, IFF_DORMANT or IFF_ECHO.

Fixes: 4a91cb61bb99 ("uapi glibc compat: fix compile errors when glibc net/if.h included before linux/if.h")
Signed-off-by: Jonas Gorski <jonas.gorski@...il.com>
Reviewed-by: Mikko Rapeli <mikko.rapeli@....fi>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 include/uapi/linux/if.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/uapi/linux/if.h b/include/uapi/linux/if.h
index 752f5dc040a51..0829d6d5e917a 100644
--- a/include/uapi/linux/if.h
+++ b/include/uapi/linux/if.h
@@ -31,7 +31,7 @@
 #include <linux/hdlc/ioctl.h>
 
 /* For glibc compatibility. An empty enum does not compile. */
-#if __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO != 0 && \
+#if __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO != 0 || \
     __UAPI_DEF_IF_NET_DEVICE_FLAGS != 0
 /**
  * enum net_device_flags - &struct net_device flags
@@ -99,7 +99,7 @@ enum net_device_flags {
 	IFF_ECHO			= 1<<18, /* volatile */
 #endif /* __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO */
 };
-#endif /* __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO != 0 && __UAPI_DEF_IF_NET_DEVICE_FLAGS != 0 */
+#endif /* __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO != 0 || __UAPI_DEF_IF_NET_DEVICE_FLAGS != 0 */
 
 /* for compatibility with glibc net/if.h */
 #if __UAPI_DEF_IF_NET_DEVICE_FLAGS
-- 
2.20.1