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author | Jens Axboe <axboe@kernel.dk> | 2024-02-01 16:42:36 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-02-16 21:10:56 +0300 |
commit | 0ceb7a9230d662633afe6b748bdbd4ba3d3c6328 (patch) | |
tree | d3323d18fa1d46ba134f6cd7d24a5fa51d7cd376 /lib/Kconfig.kasan | |
parent | 7a62d444a252ea7b95a72172aa0c5e909adcdbf0 (diff) | |
download | linux-0ceb7a9230d662633afe6b748bdbd4ba3d3c6328.tar.xz |
io_uring/net: fix sr->len for IORING_OP_RECV with MSG_WAITALL and buffers
commit 72bd80252feeb3bef8724230ee15d9f7ab541c6e upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib/Kconfig.kasan')
0 files changed, 0 insertions, 0 deletions