From 63415767a2446136372e777cde5bb351f21ec21d Mon Sep 17 00:00:00 2001 From: Lv Yunlong Date: Mon, 29 Mar 2021 05:36:48 -0700 Subject: ethernet: myri10ge: Fix a use after free in myri10ge_sw_tso In myri10ge_sw_tso, the skb_list_walk_safe macro will set (curr) = (segs) and (next) = (curr)->next. If status!=0 is true, the memory pointed by curr and segs will be free by dev_kfree_skb_any(curr). But later, the segs is used by segs = segs->next and causes a uaf. As (next) = (curr)->next, my patch replaces seg->next to next. Fixes: 536577f36ff7a ("net: myri10ge: use skb_list_walk_safe helper for gso segments") Signed-off-by: Lv Yunlong Signed-off-by: David S. Miller --- drivers/net/ethernet/myricom/myri10ge/myri10ge.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/net/ethernet/myricom') diff --git a/drivers/net/ethernet/myricom/myri10ge/myri10ge.c b/drivers/net/ethernet/myricom/myri10ge/myri10ge.c index 1634ca6d4a8f..c84c8bf2bc20 100644 --- a/drivers/net/ethernet/myricom/myri10ge/myri10ge.c +++ b/drivers/net/ethernet/myricom/myri10ge/myri10ge.c @@ -2897,7 +2897,7 @@ static netdev_tx_t myri10ge_sw_tso(struct sk_buff *skb, dev_kfree_skb_any(curr); if (segs != NULL) { curr = segs; - segs = segs->next; + segs = next; curr->next = NULL; dev_kfree_skb_any(segs); } -- cgit v1.2.3