diff options
| author | Jens Axboe <axboe@kernel.dk> | 2024-02-01 06:42:36 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2024-02-01 06:42:36 -0700 |
| commit | 72bd80252feeb3bef8724230ee15d9f7ab541c6e (patch) | |
| tree | dabc690cf67a86760697180a038ba4b9e4a4b82b /io_uring | |
| parent | 76b367a2d83163cf19173d5cb0b562acbabc8eac (diff) | |
io_uring/net: fix sr->len for IORING_OP_RECV with MSG_WAITALL and buffers
If we use IORING_OP_RECV with provided buffers and pass in '0' as the
length of the request, the length is retrieved from the selected buffer.
If MSG_WAITALL is also set and we get a short receive, then we may hit
the retry path which decrements sr->len and increments the buffer for
a retry. However, the length is still zero at this point, which means
that sr->len now becomes huge and import_ubuf() will cap it to
MAX_RW_COUNT and subsequently return -EFAULT for the range as a whole.
Fix this by always assigning sr->len once the buffer has been selected.
Cc: stable@vger.kernel.org
Fixes: 7ba89d2af17a ("io_uring: ensure recv and recvmsg handle MSG_WAITALL correctly")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring')
| -rw-r--r-- | io_uring/net.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/io_uring/net.c b/io_uring/net.c index a12ff69e6843..43bc9a5f96f9 100644 --- a/io_uring/net.c +++ b/io_uring/net.c @@ -923,6 +923,7 @@ retry_multishot: if (!buf) return -ENOBUFS; sr->buf = buf; + sr->len = len; } ret = import_ubuf(ITER_DEST, sr->buf, len, &msg.msg_iter); |