Re: [PATCH bpf-next 2/4] LoongArch: BPF: Fix memory leak in bpf_jit_free

On Fri, Jul 24, 2026 at 4:05=E2=80=AFPM Tiezhu Yang <[email protected]=
> wrote:
>
> Cc: Huacai Chen <[email protected]> [email protected]
>
> On 2026/7/22 =E4=B8=8B=E5=8D=887:27, Pu Lehui wrote:
> > From: Pu Lehui <[email protected]>
> >
> > 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 an=
d
> > calls bpf_jit_free() to clean up the first subprogram. However,
> > bpf_jit_free() fails to free jit_data->ctx.offset, which causes a memor=
y
> > leak of the JIT context offsets array.
> >
> > Fix this by adding the missing kvfree(jit_data->ctx.offset) in
> > bpf_jit_free().
> >
> > Fixes: 4ab17e762b34 ("LoongArch: BPF: Use BPF prog pack allocator")
> > Reported-by: Sashiko <[email protected]>
> > Signed-off-by: Pu Lehui <[email protected]>
> > ---
> >   arch/loongarch/net/bpf_jit.c | 1 +
> >   1 file changed, 1 insertion(+)
> >
> > diff --git a/arch/loongarch/net/bpf_jit.c b/arch/loongarch/net/bpf_jit.=
c
> > index 2738b4db1165..3d3ed1677d01 100644
> > --- a/arch/loongarch/net/bpf_jit.c
> > +++ b/arch/loongarch/net/bpf_jit.c
> > @@ -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 =3D bpf_jit_binary_pack_hdr(prog);
> >
>
> Here is the link:
> https://lore.kernel.org/bpf/20260722112754.1615201-3-pulehui@huaweicloud.=
com/
>
> Acked-by: Tiezhu Yang <[email protected]>
Applied, thanks.

Huacai
>
> Thanks,
> Tiezhu
>
>