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bpf: test_run: Fix ctx leak in bpf_prog_test_run_xdp error path

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Fix a memory leak in bpf_prog_test_run_xdp() where the context buffer
allocated by bpf_ctx_init() is not freed when the function returns early
due to a data size check.

On the failing path:
  ctx = bpf_ctx_init(...);
  if (kattr->test.data_size_in - meta_sz < ETH_HLEN)
      return -EINVAL;

The early return bypasses the cleanup label that kfree()s ctx, leading to a
leak detectable by kmemleak under fuzzing. Change the return to jump to the
existing free_ctx label.

Fixes: fe9544ed1a ("bpf: Support specifying linear xdp packet data size for BPF_PROG_TEST_RUN")
Reported-by: BPF Runtime Fuzzer (BRF)
Signed-off-by: Shardul Bankar <shardulsb08@gmail.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://patch.msgid.link/20251014120037.1981316-1-shardulsb08@gmail.com
This commit is contained in:
Shardul Bankar 2025-10-14 17:30:37 +05:30 committed by Martin KaFai Lau
parent 3a86608788
commit 7f9ee5fc97
1 changed files with 1 additions and 1 deletions
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2
net/bpf/test_run.c
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@ -1269,7 +1269,7 @@ int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
goto free_ctx;
if (kattr->test.data_size_in - meta_sz < ETH_HLEN)
return -EINVAL;
goto free_ctx;
data = bpf_test_init(kattr, linear_sz, max_linear_sz, headroom, tailroom);
if (IS_ERR(data)) {