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Diffstat (limited to 'net/core/bpf_sk_storage.c')
-rw-r--r--net/core/bpf_sk_storage.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/core/bpf_sk_storage.c b/net/core/bpf_sk_storage.c
index cc9597a87770..d1c4e1f3be2c 100644
--- a/net/core/bpf_sk_storage.c
+++ b/net/core/bpf_sk_storage.c
@@ -633,7 +633,8 @@ static struct bpf_map *bpf_sk_storage_map_alloc(union bpf_attr *attr)
return ERR_PTR(-ENOMEM);
bpf_map_init_from_attr(&smap->map, attr);
- smap->bucket_log = ilog2(roundup_pow_of_two(num_possible_cpus()));
+ /* Use at least 2 buckets, select_bucket() is undefined behavior with 1 bucket */
+ smap->bucket_log = max_t(u32, 1, ilog2(roundup_pow_of_two(num_possible_cpus())));
nbuckets = 1U << smap->bucket_log;
smap->buckets = kvcalloc(sizeof(*smap->buckets), nbuckets,
GFP_USER | __GFP_NOWARN);