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-rw-r--r--kernel/relay.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/relay.c b/kernel/relay.c
index 3b299fb3855..780269765f2 100644
--- a/kernel/relay.c
+++ b/kernel/relay.c
@@ -1074,7 +1074,9 @@ static int subbuf_splice_actor(struct file *in,
unsigned int pidx, poff, total_len, subbuf_pages, ret;
struct rchan_buf *rbuf = in->private_data;
unsigned int subbuf_size = rbuf->chan->subbuf_size;
- size_t read_start = ((size_t)*ppos) % rbuf->chan->alloc_size;
+ uint64_t pos = (uint64_t) *ppos;
+ uint32_t alloc_size = (uint32_t) rbuf->chan->alloc_size;
+ size_t read_start = (size_t) do_div(pos, alloc_size);
size_t read_subbuf = read_start / subbuf_size;
size_t padding = rbuf->padding[read_subbuf];
size_t nonpad_end = read_subbuf * subbuf_size + subbuf_size - padding;