[PKT_SCHED]: Add rtattr_strlcpy, use it where appropriate

Add rtattr_strlcpy to handle unterminated strings. The destination
is nulled out entirely to avoid possible leaks when dumping. The
return value can be checked for >= size to detect truncated strings.
Currently strings equal to the size of the destination are accepted
everywhere even if not null-terminated. Sometimes they are silently
truncated, sometimes the unterminated string is used.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index 1f02d87be6b7..c3d5d043a5ca 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -748,6 +748,7 @@ struct tcamsg
 
 #include <linux/config.h>
 
+extern size_t rtattr_strlcpy(char *dest, const struct rtattr *rta, size_t size);
 static __inline__ int rtattr_strcmp(const struct rtattr *rta, const char *str)
 {
 	int len = strlen(str) + 1;