diff options
| author | Björn Töpel <bjorn@kernel.org> | 2021-10-28 15:51:15 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2021-10-28 18:14:30 +0300 |
| commit | 27de809a3d83a6199664479ebb19712533d6fd9b (patch) | |
| tree | 2d56959a9820f52d44b59e5410c44d8de01f2879 | |
| parent | 20af8864a3029fde67fd00999f58bc1ada632374 (diff) | |
| download | linux-27de809a3d83a6199664479ebb19712533d6fd9b.tar.xz | |
riscv, bpf: Fix potential NULL dereference
The bpf_jit_binary_free() function requires a non-NULL argument. When
the RISC-V BPF JIT fails to converge in NR_JIT_ITERATIONS steps,
jit_data->header will be NULL, which triggers a NULL
dereference. Avoid this by checking the argument, prior calling the
function.
Fixes: ca6cb5447cec ("riscv, bpf: Factor common RISC-V JIT code")
Signed-off-by: Björn Töpel <bjorn@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/r/20211028125115.514587-1-bjorn@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
| -rw-r--r-- | arch/riscv/net/bpf_jit_core.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/riscv/net/bpf_jit_core.c b/arch/riscv/net/bpf_jit_core.c index 0fee2cbaaf53..753d85bdfad0 100644 --- a/arch/riscv/net/bpf_jit_core.c +++ b/arch/riscv/net/bpf_jit_core.c @@ -125,7 +125,8 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog) if (i == NR_JIT_ITERATIONS) { pr_err("bpf-jit: image did not converge in <%d passes!\n", i); - bpf_jit_binary_free(jit_data->header); + if (jit_data->header) + bpf_jit_binary_free(jit_data->header); prog = orig_prog; goto out_offset; } |