[PATCH 4.4 63/88] bpf/verifier: Add spi variable to check_stack_write()

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ben Hutchings <ben.hutchi...@codethink.co.uk>

Extracted from commit dc503a8ad984 "bpf/verifier: track liveness for
pruning".

Cc: Daniel Borkmann <dan...@iogearbox.net>
Cc: Alexei Starovoitov <a...@kernel.org>
Signed-off-by: Ben Hutchings <ben.hutchi...@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 kernel/bpf/verifier.c |    8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -572,7 +572,7 @@ static bool is_spillable_regtype(enum bp
 static int check_stack_write(struct verifier_state *state, int off, int size,
                             int value_regno)
 {
-       int i;
+       int i, spi = (MAX_BPF_STACK + off) / BPF_REG_SIZE;
        /* caller checked that off % size == 0 and -MAX_BPF_STACK <= off < 0,
         * so it's aligned access and [off, off + size) are within stack limits
         */
@@ -587,15 +587,13 @@ static int check_stack_write(struct veri
                }
 
                /* save register state */
-               state->spilled_regs[(MAX_BPF_STACK + off) / BPF_REG_SIZE] =
-                       state->regs[value_regno];
+               state->spilled_regs[spi] = state->regs[value_regno];
 
                for (i = 0; i < BPF_REG_SIZE; i++)
                        state->stack_slot_type[MAX_BPF_STACK + off + i] = 
STACK_SPILL;
        } else {
                /* regular write of data into stack */
-               state->spilled_regs[(MAX_BPF_STACK + off) / BPF_REG_SIZE] =
-                       (struct reg_state) {};
+               state->spilled_regs[spi] = (struct reg_state) {};
 
                for (i = 0; i < size; i++)
                        state->stack_slot_type[MAX_BPF_STACK + off + i] = 
STACK_MISC;