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LoongArch: BPF: Fix memory leak in bpf_jit_free()

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When bpf_int_jit_compile() is called for subprograms, it returns early
during the first pass (!prog->is_func || extra_pass is false), keeping
ctx->offset alive for the subsequent extra pass.

If JIT compilation fails for a later subprogram, the BPF core aborts and
calls bpf_jit_free() to clean up the first subprogram. However,
bpf_jit_free() fails to free jit_data->ctx.offset, which causes a memory
leak of the JIT context offsets array.

So fix this by adding the missing kvfree(jit_data->ctx.offset) in
bpf_jit_free().

Reported-by: Sashiko <sashiko-bot@kernel.org>
Fixes: 4ab17e762b ("LoongArch: BPF: Use BPF prog pack allocator")
Acked-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Pu Lehui <pulehui@huawei.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Pu Lehui 2026-07-24 16:33:08 +08:00 committed by Huacai Chen
parent dacd348b8a
commit 47e20d4b3d
1 changed files with 1 additions and 0 deletions
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arch/loongarch/net/bpf_jit.c
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@ -2361,6 +2361,7 @@ void bpf_jit_free(struct bpf_prog *prog)
*/
if (jit_data) {
bpf_jit_binary_pack_finalize(jit_data->ro_header, jit_data->header);
kvfree(jit_data->ctx.offset);
kfree(jit_data);
}
hdr = bpf_jit_binary_pack_hdr(prog);