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From 99ad3018eac4089569f5ccbc84737dce8e92384f Mon Sep 17 00:00:00 2001
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From: Miroslav Rezanina <mrezanin@redhat.com>
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Date: Wed, 31 Jul 2013 09:54:07 +0200
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Subject: vmdk: Allow reading variable size descriptor files
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Message-id: <1374654509-5535-3-git-send-email-famz@redhat.com>
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Patchwork-id: 52674
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O-Subject: [RHEL-7 qemu-kvm PATCH 2/5] vmdk: Allow reading variable size descriptor files
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Bugzilla: 836675
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
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From: Evgeny Budilovsky <evgeny.budilovsky@ravellosystems.com>
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the hard-coded 2k buffer on the stack won't allow reading big descriptor
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files which can be generated when storing big images. For example 500G
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vmdk splitted to 2G chunks.
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Signed-off-by: Evgeny Budilovsky <evgeny.budilovsky@ravellosystems.com>
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Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit 0bed087df24c7b3fae366f239b9d150de3309416)
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Signed-off-by: Fam Zheng <famz@redhat.com>
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diff --git a/block/vmdk.c b/block/vmdk.c
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index ee50a73..65ae011 100644
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--- a/block/vmdk.c
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+++ b/block/vmdk.c
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@@ -722,27 +722,40 @@ static int vmdk_open_desc_file(BlockDriverState *bs, int flags,
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int64_t desc_offset)
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{
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int ret;
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- char buf[2048];
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+ char *buf = NULL;
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char ct[128];
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BDRVVmdkState *s = bs->opaque;
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+ int64_t size;
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- ret = bdrv_pread(bs->file, desc_offset, buf, sizeof(buf));
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+ size = bdrv_getlength(bs->file);
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+ if (size < 0) {
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+ return -EINVAL;
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+ }
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+
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+ size = MIN(size, 1 << 20); /* avoid unbounded allocation */
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+ buf = g_malloc0(size + 1);
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+
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+ ret = bdrv_pread(bs->file, desc_offset, buf, size);
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if (ret < 0) {
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- return ret;
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+ goto exit;
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}
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- buf[2047] = '\0';
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if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) {
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- return -EMEDIUMTYPE;
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+ ret = -EMEDIUMTYPE;
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+ goto exit;
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}
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if (strcmp(ct, "monolithicFlat") &&
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strcmp(ct, "twoGbMaxExtentSparse") &&
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strcmp(ct, "twoGbMaxExtentFlat")) {
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fprintf(stderr,
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"VMDK: Not supported image type \"%s\""".\n", ct);
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- return -ENOTSUP;
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+ ret = -ENOTSUP;
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+ goto exit;
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}
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s->desc_offset = 0;
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- return vmdk_parse_extents(buf, bs, bs->file->filename);
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+ ret = vmdk_parse_extents(buf, bs, bs->file->filename);
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+exit:
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+ g_free(buf);
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+ return ret;
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}
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static int vmdk_open(BlockDriverState *bs, QDict *options, int flags)
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