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authorToke Høiland-Jørgensen <toke@redhat.com>2019-10-17 12:57:02 +0200
committerAlexei Starovoitov <ast@kernel.org>2019-10-18 16:18:42 -0700
commit05679ca6feebc1ef3bf743563315d9975adcf6fb (patch)
tree9c8479b01ec1f2baee2dc45a7cf278fe4320de13 /kernel
parent11875ba7f251c52effb2b924e04c2ddefa9856ef (diff)
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.c2
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 */