From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Stefan Reiter Date: Tue, 2 Mar 2021 16:11:54 +0100 Subject: [PATCH] block/io: accept NULL qiov in bdrv_pad_request Some operations, e.g. block-stream, perform reads while discarding the results (only copy-on-read matters). In this case they will pass NULL as the target QEMUIOVector, which will however trip bdrv_pad_request, since it wants to extend its passed vector. Simply check for NULL and do nothing, there's no reason to pad the target if it will be discarded anyway. Signed-off-by: Thomas Lamprecht --- block/io.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/block/io.c b/block/io.c index f38e7f81d8..28c3a712b6 100644 --- a/block/io.c +++ b/block/io.c @@ -1764,6 +1764,10 @@ static int bdrv_pad_request(BlockDriverState *bs, { int ret; + if (!qiov) { + return 0; + } + bdrv_check_qiov_request(*offset, *bytes, *qiov, *qiov_offset, &error_abort); if (!bdrv_init_padding(bs, *offset, *bytes, pad)) {