[PATCH 4.14 29/57] bpf: Check for integer overflow when using roundup_pow_of_two()

Greg Kroah-Hartman
2021-02-22T13:14:16Z

From: Bui Quang Minh <minhquangbui99@gmail.com>

[ Upstream commit 6183f4d3a0a2ad230511987c6c362ca43ec0055f ]

On 32-bit architecture, roundup_pow_of_two() can return 0 when the argument
has upper most bit set due to resulting 1UL << 32. Add a check for this case.

Fixes: d5a3b1f69186 ("bpf: introduce BPF_MAP_TYPE_STACK_TRACE")
Signed-off-by: Bui Quang Minh <minhquangbui99@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20210127063653.3576-1-minhquangbui99@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
kernel/bpf/stackmap.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c
index 135be433e9a0f..1d4c3fba0f8cd 100644
--- a/kernel/bpf/stackmap.c
+++ b/kernel/bpf/stackmap.c
@@ -71,6 +71,8 @@ static struct bpf_map *stack_map_alloc(union bpf_attr *attr)

/* hash table size must be power of 2 */
n_buckets = roundup_pow_of_two(attr->max_entries);
+ if (!n_buckets)
+ return ERR_PTR(-E2BIG);

cost = n_buckets * sizeof(struct stack_map_bucket *) + sizeof(*smap);
if (cost >= U32_MAX - PAGE_SIZE)
--
2.27.0