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| author | Menglong Dong <imagedong@tencent.com> | 2022-05-13 11:03:36 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-05-16 10:47:43 +0100 |
| commit | a3af33abd9210c93dc829b4fdd7a19f63f168a25 (patch) | |
| tree | 7f4c61b9ab4241fd95cb616c8d95ad56632687ec /net | |
| parent | 3aba103006bcc4a7472b7c9506b3bc065ffb7992 (diff) | |
| download | linux-a3af33abd9210c93dc829b4fdd7a19f63f168a25.tar.bz2 | |
net: dm: check the boundary of skb drop reasons
The 'reason' will be set to 'SKB_DROP_REASON_NOT_SPECIFIED' if it not
small that SKB_DROP_REASON_MAX in net_dm_packet_trace_kfree_skb_hit(),
but it can't avoid it to be 0, which is invalid and can cause NULL
pointer in drop_reasons.
Therefore, reset it to SKB_DROP_REASON_NOT_SPECIFIED when 'reason <= 0'.
Reviewed-by: Jiang Biao <benbjiang@tencent.com>
Reviewed-by: Hao Peng <flyingpeng@tencent.com>
Signed-off-by: Menglong Dong <imagedong@tencent.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/drop_monitor.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/core/drop_monitor.c b/net/core/drop_monitor.c index b89e3e95bffc..41cac0e4834e 100644 --- a/net/core/drop_monitor.c +++ b/net/core/drop_monitor.c @@ -517,7 +517,7 @@ static void net_dm_packet_trace_kfree_skb_hit(void *ignore, if (!nskb) return; - if ((unsigned int)reason >= SKB_DROP_REASON_MAX) + if (unlikely(reason >= SKB_DROP_REASON_MAX || reason <= 0)) reason = SKB_DROP_REASON_NOT_SPECIFIED; cb = NET_DM_SKB_CB(nskb); cb->reason = reason; |