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-rw-r--r--net/compat.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/compat.c b/net/compat.c
index d74d82155d78..377e560ab5c9 100644
--- a/net/compat.c
+++ b/net/compat.c
@@ -254,6 +254,8 @@ int put_cmsg_compat(struct msghdr *kmsg, int level, int type, int len, void *dat
if (copy_to_user(CMSG_COMPAT_DATA(cm), data, cmlen - sizeof(struct compat_cmsghdr)))
return -EFAULT;
cmlen = CMSG_COMPAT_SPACE(len);
+ if (kmsg->msg_controllen < cmlen)
+ cmlen = kmsg->msg_controllen;
kmsg->msg_control += cmlen;
kmsg->msg_controllen -= cmlen;
return 0;

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