bpf: Check for integer overflow when using roundup_pow_of_two()

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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: d5a3b1f691 ("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

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Bui Quang Minh 2021-01-27 06:36:53 +00:00 • committed by Daniel Borkmann

parent 548f1191d8

commit 6183f4d3a0

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kernel/bpf/stackmap.c

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