From 341a7213e5c1ce274cc0f02270054905800ea660 Mon Sep 17 00:00:00 2001 From: Pengcheng Yang Date: Thu, 4 Jun 2020 16:51:30 -0700 Subject: [PATCH] kernel/relay.c: fix read_pos error when multiple readers When reading, read_pos should start with bytes_consumed, not file->f_pos. Because when there is more than one reader, the read_pos corresponding to file->f_pos may have been consumed, which will cause the data that has been consumed to be read and the bytes_consumed update error. Signed-off-by: Pengcheng Yang Signed-off-by: Andrew Morton Reviewed-by: Jens Axboe Cc: Greg Kroah-Hartman Cc: Jann Horn Cc: Al Viro e Link: http://lkml.kernel.org/r/1579691175-28949-1-git-send-email-yangpc@wangsu.com Signed-off-by: Linus Torvalds --- kernel/relay.c | 17 +++++++---------- 1 file changed, 7 insertions(+), 10 deletions(-) diff --git a/kernel/relay.c b/kernel/relay.c index dc82705e1cff..204867220f8a 100644 --- a/kernel/relay.c +++ b/kernel/relay.c @@ -996,14 +996,14 @@ static void relay_file_read_consume(struct rchan_buf *buf, /* * relay_file_read_avail - boolean, are there unconsumed bytes available? */ -static int relay_file_read_avail(struct rchan_buf *buf, size_t read_pos) +static int relay_file_read_avail(struct rchan_buf *buf) { size_t subbuf_size = buf->chan->subbuf_size; size_t n_subbufs = buf->chan->n_subbufs; size_t produced = buf->subbufs_produced; size_t consumed = buf->subbufs_consumed; - relay_file_read_consume(buf, read_pos, 0); + relay_file_read_consume(buf, 0, 0); consumed = buf->subbufs_consumed; @@ -1064,23 +1064,20 @@ static size_t relay_file_read_subbuf_avail(size_t read_pos, /** * relay_file_read_start_pos - find the first available byte to read - * @read_pos: file read position * @buf: relay channel buffer * - * If the @read_pos is in the middle of padding, return the + * If the read_pos is in the middle of padding, return the * position of the first actually available byte, otherwise * return the original value. */ -static size_t relay_file_read_start_pos(size_t read_pos, - struct rchan_buf *buf) +static size_t relay_file_read_start_pos(struct rchan_buf *buf) { size_t read_subbuf, padding, padding_start, padding_end; size_t subbuf_size = buf->chan->subbuf_size; size_t n_subbufs = buf->chan->n_subbufs; size_t consumed = buf->subbufs_consumed % n_subbufs; + size_t read_pos = consumed * subbuf_size + buf->bytes_consumed; - if (!read_pos) - read_pos = consumed * subbuf_size + buf->bytes_consumed; read_subbuf = read_pos / subbuf_size; padding = buf->padding[read_subbuf]; padding_start = (read_subbuf + 1) * subbuf_size - padding; @@ -1136,10 +1133,10 @@ static ssize_t relay_file_read(struct file *filp, do { void *from; - if (!relay_file_read_avail(buf, *ppos)) + if (!relay_file_read_avail(buf)) break; - read_start = relay_file_read_start_pos(*ppos, buf); + read_start = relay_file_read_start_pos(buf); avail = relay_file_read_subbuf_avail(read_start, buf); if (!avail) break;