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io_uring/kbuf: don't truncate end buffer for multiple buffer peeks

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If peeking a bunch of buffers, normally io_ring_buffers_peek() will
truncate the end buffer. This isn't optimal as presumably more data will
be arriving later, and hence it's better to stop with the last full
buffer rather than truncate the end buffer.

Cc: stable@vger.kernel.org
Fixes: 35c8711c8f ("io_uring/kbuf: add helpers for getting/peeking multiple buffers")
Reported-by: Christian Mazakas <christian.mazakas@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2025-06-13 11:01:49 -06:00
parent c538f400fa
commit 26ec15e4b0
1 changed files with 4 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

5
io_uring/kbuf.c
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@ -270,8 +270,11 @@ static int io_ring_buffers_peek(struct io_kiocb *req, struct buf_sel_arg *arg,
/* truncate end piece, if needed, for non partial buffers */
if (len > arg->max_len) {
len = arg->max_len;
if (!(bl->flags & IOBL_INC))
if (!(bl->flags & IOBL_INC)) {
if (iov != arg->iovs)
break;
buf->len = len;
}
}
iov->iov_base = u64_to_user_ptr(buf->addr);