34 lines
1.1 KiB
Diff
34 lines
1.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Stefan Reiter <s.reiter@proxmox.com>
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Date: Tue, 2 Mar 2021 16:11:54 +0100
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Subject: [PATCH] block/io: accept NULL qiov in bdrv_pad_request
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Some operations, e.g. block-stream, perform reads while discarding the
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results (only copy-on-read matters). In this case they will pass NULL as
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the target QEMUIOVector, which will however trip bdrv_pad_request, since
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it wants to extend its passed vector.
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Simply check for NULL and do nothing, there's no reason to pad the
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target if it will be discarded anyway.
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Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
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---
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block/io.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/block/io.c b/block/io.c
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index 83d1b1dfdc..24a3c84c93 100644
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--- a/block/io.c
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+++ b/block/io.c
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@@ -1710,6 +1710,10 @@ static int bdrv_pad_request(BlockDriverState *bs,
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int sliced_niov;
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size_t sliced_head, sliced_tail;
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+ if (!qiov) {
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+ return 0;
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+ }
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+
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/* Should have been checked by the caller already */
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ret = bdrv_check_request32(*offset, *bytes, *qiov, *qiov_offset);
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if (ret < 0) {
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