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| author | Bui Quang Minh <minhquangbui99@gmail.com> | 2021-06-13 17:34:39 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2021-06-22 20:14:29 +0300 |
| commit | 7dd5d437c258bbf4cc15b35229e5208b87b8b4e0 (patch) | |
| tree | 15bd18fdc23176c4b1cc3bef90042a8a068dd22a /kernel/bpf/devmap.c | |
| parent | 5dec6d96d12d33900ec315972c8e47a73bcc378d (diff) | |
| download | linux-7dd5d437c258bbf4cc15b35229e5208b87b8b4e0.tar.xz | |
bpf: Fix integer overflow in argument calculation for bpf_map_area_alloc
In 32-bit architecture, the result of sizeof() is a 32-bit integer so
the expression becomes the multiplication between 2 32-bit integer which
can potentially leads to integer overflow. As a result,
bpf_map_area_alloc() allocates less memory than needed.
Fix this by casting 1 operand to u64.
Fixes: 0d2c4f964050 ("bpf: Eliminate rlimit-based memory accounting for sockmap and sockhash maps")
Fixes: 99c51064fb06 ("devmap: Use bpf_map_area_alloc() for allocating hash buckets")
Fixes: 546ac1ffb70d ("bpf: add devmap, a map for storing net device references")
Signed-off-by: Bui Quang Minh <minhquangbui99@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210613143440.71975-1-minhquangbui99@gmail.com
Diffstat (limited to 'kernel/bpf/devmap.c')
| -rw-r--r-- | kernel/bpf/devmap.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c index aa516472ce46..3b45c23286c0 100644 --- a/kernel/bpf/devmap.c +++ b/kernel/bpf/devmap.c @@ -92,7 +92,7 @@ static struct hlist_head *dev_map_create_hash(unsigned int entries, int i; struct hlist_head *hash; - hash = bpf_map_area_alloc(entries * sizeof(*hash), numa_node); + hash = bpf_map_area_alloc((u64) entries * sizeof(*hash), numa_node); if (hash != NULL) for (i = 0; i < entries; i++) INIT_HLIST_HEAD(&hash[i]); @@ -143,7 +143,7 @@ static int dev_map_init_map(struct bpf_dtab *dtab, union bpf_attr *attr) spin_lock_init(&dtab->index_lock); } else { - dtab->netdev_map = bpf_map_area_alloc(dtab->map.max_entries * + dtab->netdev_map = bpf_map_area_alloc((u64) dtab->map.max_entries * sizeof(struct bpf_dtab_netdev *), dtab->map.numa_node); if (!dtab->netdev_map) |