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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1729615767; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=0s2NzQAkVXUXjzpQCMdLxQHeBTEoVVx/FCeKoPNe9Qw=; b=a8qJcXMcpAlFAhYrlqQ+y9xFRfghZuI2tOtFdlxsjuUkVDG7Q3nLX490RJXttpTnh8BKjd JWHMgioEeXa3DuNuGeM2GdiZPnRgzKnA+mhc9O5QbU7xGVrJX4VLfUdmolfesA4A84w2Dy 5M8B5yANXX27YOpTYNudFlflPM/Buck= X-MC-Unique: X46m07fuMb-7huM5XCIdmg-1 From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, qemu-devel@nongnu.org Subject: [PULL 4/9] block/vdi.c: Make SECTOR_SIZE constant 64-bits Date: Tue, 22 Oct 2024 18:48:58 +0200 Message-ID: <20241022164903.282174-5-kwolf@redhat.com> In-Reply-To: <20241022164903.282174-1-kwolf@redhat.com> References: <20241022164903.282174-1-kwolf@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" From: Peter Maydell Make the VDI SECTOR_SIZE define be a 64-bit constant; this matches how we define BDRV_SECTOR_SIZE. The benefit is that it means that we don't need to carefully cast to 64-bits when doing operations like "n_sectors * SECTOR_SIZE" to avoid doing a 32x32->32 multiply, which might overflow, and which Coverity and other static analysers tend to warn about. The specific potential overflow Coverity is highlighting is the one at the end of vdi_co_pwritev() where we write out n_sectors sectors to the block map. This is very unlikely to actually overflow, since the block map has 4 bytes per block and the maximum number of blocks in the image must fit into a 32-bit integer. So this commit is not fixing a real-world bug. An inspection of all the places currently using SECTOR_SIZE in the file shows none which care about the change in its type, except for one call to error_setg() which needs the format string adjusting. Resolves: Coverity CID 1508076 Suggested-by: Kevin Wolf Message-ID: <20241008164708.2966400-5-peter.maydell@linaro.org> Reviewed-by: Kevin Wolf Signed-off-by: Kevin Wolf --- block/vdi.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/block/vdi.c b/block/vdi.c index 149e15c831..26f7638f1f 100644 --- a/block/vdi.c +++ b/block/vdi.c @@ -87,7 +87,7 @@ /* Command line option for static images. */ #define BLOCK_OPT_STATIC "static" =20 -#define SECTOR_SIZE 512 +#define SECTOR_SIZE 512ULL #define DEFAULT_CLUSTER_SIZE 1048576 /* Note: can't use 1 * MiB, because it's passed to stringify() */ =20 @@ -442,7 +442,7 @@ static int vdi_open(BlockDriverState *bs, QDict *option= s, int flags, goto fail; } else if (header.sector_size !=3D SECTOR_SIZE) { error_setg(errp, "unsupported VDI image (sector size %" PRIu32 - " is not %u)", header.sector_size, SECTOR_SIZE); + " is not %llu)", header.sector_size, SECTOR_SIZE); ret =3D -ENOTSUP; goto fail; } else if (header.block_size !=3D DEFAULT_CLUSTER_SIZE) { --=20 2.47.0