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libbpf: Also reset {insn,data}_cur on realloc failure

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realloc_insn_buf() as well as realloc_data_buf() free and NULL
gen->insn_start / gen->data_start on -ENOMEM but leave gen->insn_cur /
gen->data_cur pointing into the old, freed buffer. Just reset the
cursors to NULL alongside the base pointers so the freed state is
coherent.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/r/20260529094119.307264-3-daniel@iogearbox.net
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Daniel Borkmann 2026-05-29 11:41:18 +02:00 committed by Alexei Starovoitov
parent 3c5e2f1a85
commit d2f7bd066e
1 changed files with 2 additions and 0 deletions
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2
tools/lib/bpf/gen_loader.c
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@ -63,6 +63,7 @@ static int realloc_insn_buf(struct bpf_gen *gen, __u32 size)
gen->error = -ENOMEM;
free(gen->insn_start);
gen->insn_start = NULL;
gen->insn_cur = NULL;
return -ENOMEM;
}
gen->insn_start = insn_start;
@ -86,6 +87,7 @@ static int realloc_data_buf(struct bpf_gen *gen, __u32 size)
gen->error = -ENOMEM;
free(gen->data_start);
gen->data_start = NULL;
gen->data_cur = NULL;
return -ENOMEM;
}
gen->data_start = data_start;