Add a check if payload's offset is a power of 2 when selecting ops. The fast ops were meant for well aligned offsets, also this fixes a small bug when using unaligned offset and length of 3 which causes only 1 byte to be loaded because the fast ops are chosen. Signed-off-by: Nikolay Aleksandrov <nikolay@xxxxxxxxxx> --- I broke the line since it was >80 chars. This patch applies to Dave's -net tree. net/netfilter/nft_payload.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/net/netfilter/nft_payload.c b/net/netfilter/nft_payload.c index a2aeb31..15a3dcb 100644 --- a/net/netfilter/nft_payload.c +++ b/net/netfilter/nft_payload.c @@ -135,7 +135,9 @@ nft_payload_select_ops(const struct nft_ctx *ctx, if (len == 0 || len > FIELD_SIZEOF(struct nft_data, data)) return ERR_PTR(-EINVAL); - if (len <= 4 && IS_ALIGNED(offset, len) && base != NFT_PAYLOAD_LL_HEADER) + if (len <= 4 && IS_ALIGNED(offset, len) && + base != NFT_PAYLOAD_LL_HEADER && + !(offset & (offset - 1))) return &nft_payload_fast_ops; else return &nft_payload_ops; -- 1.8.4.2 -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
