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

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commit 26ec15e4b0c1d7b25214d9c0be1d50492e2f006c upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jens Axboe
2025-06-13 11:01:49 -06:00
committed by Greg Kroah-Hartman
parent 50452fe7ca
commit 2e10dc9c2a
1 changed files with 4 additions and 1 deletions
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5
io_uring/kbuf.c
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@@ -262,8 +262,11 @@ 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);