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io_uring/net: keep recv buffer select length within MAX_RW_COUNT

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Since commit dcbd1c0548 ("io_uring/net: let io_recv_buf_select return
the length of the buffer region"), io_recv_buf_select() returns the
selected length as an int. For a non-bundle recv with sqe->len == 0 the
length comes from the ring provided buffer, which can be up to 4G, so a
buffer of 2G or more makes io_recv() fail the request with a bogus
negative result (e.g. -2147483648) instead of receiving into it. Clamp
the length to MAX_RW_COUNT, which import_ubuf() limits the transfer to
anyway.

Fixes: dcbd1c0548 ("io_uring/net: let io_recv_buf_select return the length of the buffer region")
Cc: stable@vger.kernel.org
Signed-off-by: Tamaki Yanagawa <ty@000ty.net>
Assisted-by: Claude:claude-opus-5-5
Link: https://patch.msgid.link/20261018042227.1105-1-ty@000ty.net
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tamaki Yanagawa 2026-10-18 04:22:32 +00:00 committed by Jens Axboe
parent 98787d3fa4
commit 96262cfab5
1 changed files with 2 additions and 0 deletions
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2
io_uring/net.c
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@ -1197,6 +1197,8 @@ static int io_recv_buf_select(struct io_kiocb *req, struct io_async_msghdr *kmsg
*sel = io_buffer_select(req, &len, sr->buf_group, issue_flags);
if (!sel->addr)
return -ENOBUFS;
/* ring provided buffers can be up to 4G, keep len an int */
len = min_t(size_t, len, MAX_RW_COUNT);
sr->buf = sel->addr;
sr->len = len;
map_ubuf: