The program array index for tail-calls should be 32-bit, so zero-extend to
sanitize the value. This fixes failures seen for test_verifier test:
852/p runtime/jit: pass > 32bit index to tail_call FAIL retval 2 != 42
Fixes: b6bd53f9c4e8 ("MIPS: Add missing file for eBPF JIT.")
Signed-off-by: Tony Ambardar <Tony.Ambardar@xxxxxxxxx>
---
arch/mips/net/ebpf_jit.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/mips/net/ebpf_jit.c b/arch/mips/net/ebpf_jit.c
index 0e99cb790564..82ea20399b70 100644
--- a/arch/mips/net/ebpf_jit.c
+++ b/arch/mips/net/ebpf_jit.c
@@ -611,6 +611,8 @@ static int emit_bpf_tail_call(struct jit_ctx *ctx, int this_idx)
* if (index >= array->map.max_entries)
* goto out;
*/
+ /* Mask index as 32-bit */
+ emit_instr(ctx, dinsu, MIPS_R_A2, MIPS_R_ZERO, 32, 32);
off = offsetof(struct bpf_array, map.max_entries);
emit_instr(ctx, lwu, MIPS_R_T5, off, MIPS_R_A1);
emit_instr(ctx, sltu, MIPS_R_AT, MIPS_R_T5, MIPS_R_A2);
--
2.25.1
