diff options
| author | Daniel Borkmann <daniel@iogearbox.net> | 2017-08-17 14:59:40 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-08-17 10:15:20 -0700 |
| commit | 1ab2de2bfed3ab2073ed1e7afa2b1134930d2b70 (patch) | |
| tree | 6c6cc90ce09e7abfe81f2378f7adaa302c079227 /kernel | |
| parent | fd07a62d58c16b1fdd46f4099791c5bd242908c3 (diff) | |
bpf: fix liveness propagation to parent in spilled stack slots
Using parent->regs[] when propagating REG_LIVE_READ for spilled regs
doesn't work since parent->regs[] denote the set of normal registers
but not spilled ones. Propagate to the correct regs.
Fixes: dc503a8ad984 ("bpf/verifier: track liveness for pruning")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/bpf/verifier.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 958ba84a9995..40f669ddb571 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -3460,7 +3460,7 @@ static bool do_propagate_liveness(const struct bpf_verifier_state *state, if (parent->spilled_regs[i].live & REG_LIVE_READ) continue; if (state->spilled_regs[i].live == REG_LIVE_READ) { - parent->regs[i].live |= REG_LIVE_READ; + parent->spilled_regs[i].live |= REG_LIVE_READ; touched = true; } } |