From c380cd5a00f32a96b6c63148a939eb9f8836e184 Mon Sep 17 00:00:00 2001 From: Elena Reshetova Date: Wed, 20 Dec 2017 20:10:55 +0100 Subject: net: convert lcs_reply.refcnt from atomic_t to refcount_t atomic_t variables are currently used to implement reference counters with the following properties: - counter is initialized to 1 using atomic_set() - a resource is freed upon counter reaching zero - once counter reaches zero, its further increments aren't allowed - counter schema uses basic atomic operations (set, inc, inc_not_zero, dec_and_test, etc.) Such atomic variables should be converted to a newly provided refcount_t type and API that prevents accidental counter overflows and underflows. This is important since overflows and underflows can lead to use-after-free situation and be exploitable. The variable lcs_reply.refcnt is used as pure reference counter. Convert it to refcount_t and fix up the operations. Suggested-by: Kees Cook Reviewed-by: David Windsor Reviewed-by: Hans Liljestrand Signed-off-by: Elena Reshetova [jwi: removed the WARN_ONs. Use CONFIG_REFCOUNT_FULL if you care.] Signed-off-by: Julian Wiedmann Signed-off-by: David S. Miller --- drivers/s390/net/lcs.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/s390/net/lcs.h') diff --git a/drivers/s390/net/lcs.h b/drivers/s390/net/lcs.h index fbc8b90b1f85..bd52caa3b11b 100644 --- a/drivers/s390/net/lcs.h +++ b/drivers/s390/net/lcs.h @@ -5,6 +5,7 @@ #include #include #include +#include #include #define LCS_DBF_TEXT(level, name, text) \ @@ -271,7 +272,7 @@ struct lcs_buffer { struct lcs_reply { struct list_head list; __u16 sequence_no; - atomic_t refcnt; + refcount_t refcnt; /* Callback for completion notification. */ void (*callback)(struct lcs_card *, struct lcs_cmd *); wait_queue_head_t wait_q; -- cgit v1.2.3