selftests/bpf: fix signedness bug in redir_partial()

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[ Upstream commit 6a4bd31f68 ]

When xsend() returns -1 (error), the check 'n < sizeof(buf)' incorrectly
treats it as success due to unsigned promotion. Explicitly check for -1
first.

Fixes: a4b7193d8e ("selftests/bpf: Add sockmap test for redirecting partial skb data")
Signed-off-by: Fushuai Wang <wangfushuai@baidu.com>
Link: https://lore.kernel.org/r/20250612084208.27722-1-wangfushuai@baidu.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Fushuai Wang 2025-06-12 16:42:08 +08:00 • committed by Greg Kroah-Hartman

parent ee03766d79

commit 274bf55fcd

1 changed files with 2 additions and 0 deletions

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tools/testing/selftests/bpf/prog_tests/sockmap_listen.c

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