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| author | Toke Høiland-Jørgensen <toke@redhat.com> | 2019-10-17 12:57:02 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2019-10-18 16:18:42 -0700 |
| commit | 05679ca6feebc1ef3bf743563315d9975adcf6fb (patch) | |
| tree | 9c8479b01ec1f2baee2dc45a7cf278fe4320de13 /kernel | |
| parent | 11875ba7f251c52effb2b924e04c2ddefa9856ef (diff) | |
| download | linux-05679ca6feebc1ef3bf743563315d9975adcf6fb.tar.gz linux-05679ca6feebc1ef3bf743563315d9975adcf6fb.tar.bz2 linux-05679ca6feebc1ef3bf743563315d9975adcf6fb.zip | |
xdp: Prevent overflow in devmap_hash cost calculation for 32-bit builds
Tetsuo pointed out that without an explicit cast, the cost calculation for
devmap_hash type maps could overflow on 32-bit builds. This adds the
missing cast.
Fixes: 6f9d451ab1a3 ("xdp: Add devmap_hash map type for looking up devices by hashed index")
Reported-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20191017105702.2807093-1-toke@redhat.com
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/bpf/devmap.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c index d27f3b60ff6d..c0a48f336997 100644 --- a/kernel/bpf/devmap.c +++ b/kernel/bpf/devmap.c @@ -128,7 +128,7 @@ static int dev_map_init_map(struct bpf_dtab *dtab, union bpf_attr *attr) if (!dtab->n_buckets) /* Overflow check */ return -EINVAL; - cost += sizeof(struct hlist_head) * dtab->n_buckets; + cost += (u64) sizeof(struct hlist_head) * dtab->n_buckets; } /* if map size is larger than memlock limit, reject it */ |