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libbpf: fix potential overflow in ring__consume_n()

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ringbuf_process_ring() return int64_t, while ring__consume_n() assigns
it to int. It's highly unlikely, but possible for ringbuf_process_ring()
to return value larger than INT_MAX, so use int64_t. ring__consume_n()
does check INT_MAX before returning int result to the user.

Fixes: 4d22ea94ea ("libbpf: Add ring__consume_n / ring_buffer__consume_n")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20240430201952.888293-1-andrii@kernel.org
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Andrii Nakryiko 2024-04-30 13:19:51 -07:00 committed by Martin KaFai Lau
parent 29f38ca3e5
commit 00f0e08f23
1 changed files with 1 additions and 1 deletions
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2
tools/lib/bpf/ringbuf.c
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@ -405,7 +405,7 @@ int ring__map_fd(const struct ring *r)
int ring__consume_n(struct ring *r, size_t n)
{
int res;
int64_t res;
res = ringbuf_process_ring(r, n);
if (res < 0)