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Message-ID: <alpine.LNX.2.00.1207222335200.31033@swampdragon.chaosbits.net> Date: Sun, 22 Jul 2012 23:37:20 +0200 (CEST) From: Jesper Juhl <jj@...osbits.net> To: "David S. Miller" <davem@...emloft.net> cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH] net: Fix references to out-of-scope variables in put_cmsg_compat() In net/compat.c::put_cmsg_compat() we may assign 'data' the address of either the 'ctv' or 'cts' local variables inside the 'if (!COMPAT_USE_64BIT_TIME)' branch. Those variables go out of scope at the end of the 'if' statement, so when we use 'data' further down in 'copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr))' there's no telling what it may be refering to - not good. Fix the problem by simply giving 'ctv' and 'cts' function scope. Signed-off-by: Jesper Juhl <jj@...osbits.net> --- net/compat.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/compat.c b/net/compat.c index 1b96281..74ed1d7 100644 --- a/net/compat.c +++ b/net/compat.c @@ -221,6 +221,8 @@ int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *dat { struct compat_cmsghdr __user *cm = (struct compat_cmsghdr __user *) kmsg->msg_control; struct compat_cmsghdr cmhdr; + struct compat_timeval ctv; + struct compat_timespec cts[3]; int cmlen; if (cm == NULL || kmsg->msg_controllen < sizeof(*cm)) { @@ -229,8 +231,6 @@ int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *dat } if (!COMPAT_USE_64BIT_TIME) { - struct compat_timeval ctv; - struct compat_timespec cts[3]; if (level == SOL_SOCKET && type == SCM_TIMESTAMP) { struct timeval *tv = (struct timeval *)data; ctv.tv_sec = tv->tv_sec; -- 1.7.11.2 -- Jesper Juhl <jj@...osbits.net> http://www.chaosbits.net/ Don't top-post http://www.catb.org/jargon/html/T/top-post.html Plain text mails only, please. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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