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[4.19,17/50] bpf: Check for integer overflow when using roundup_pow_of_two()

Message ID 20210222121022.628003127@linuxfoundation.org
State Superseded
Headers show
Series None | expand

Commit Message

Greg KH Feb. 22, 2021, 12:13 p.m. UTC 
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(+)
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Patch

diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c
index 55fff5e6d9831..a47d623f59fe7 100644
--- a/kernel/bpf/stackmap.c
+++ b/kernel/bpf/stackmap.c
@@ -114,6 +114,8 @@  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)