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authorJesper Juhl <jj@chaosbits.net>2012-07-22 11:37:20 +0000
committerDavid S. Miller <davem@davemloft.net>2012-07-22 17:50:49 -0700
commit818810472b129004c16fc51bf0a570b60776bfb7 (patch)
tree132cc06300eee66d5e29905a652e79bf585416f6 /net/compat.c
parent5e9965c15ba88319500284e590733f4a4629a288 (diff)
downloadlinux-818810472b129004c16fc51bf0a570b60776bfb7.tar.gz
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@chaosbits.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/compat.c')
-rw-r--r--net/compat.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/compat.c b/net/compat.c
index 1b96281892d..74ed1d7a84a 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;