From: Greg KH <gre...@linuxfoundation.org> 3.4-stable review patch. If anyone has any objections, please let me know.
------------------ From: Jesper Juhl <j...@chaosbits.net> [ Upstream commit 818810472b129004c16fc51bf0a570b60776bfb7 ] 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 <j...@chaosbits.net> Signed-off-by: David S. Miller <da...@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- net/compat.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/net/compat.c +++ b/net/compat.c @@ -221,6 +221,8 @@ int put_cmsg_compat(struct msghdr *kmsg, { 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, } 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; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/