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block/vdi: Don't assume that blocks are larger than VdiHeader

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Given that the block size is read from the header of the VDI file, a
wide variety of sizes might be seen. Rather than re-using a block
sized memory region when writing the VDI header, allocate an
appropriately sized buffer.

Signed-off-by: David Edmondson <david.edmondson@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Max Reitz <mreitz@redhat.com>
Message-id: 20210325112941.365238-3-pbonzini@redhat.com
Message-Id: <20210309144015.557477-3-david.edmondson@oracle.com>
Acked-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
David Edmondson 2021-03-25 12:29:37 +01:00 committed by Stefan Hajnoczi
parent 574b8304cf
commit 07ee2ab4fd
1 changed files with 6 additions and 4 deletions
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10
block/vdi.c
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@ -696,18 +696,20 @@ nonallocating_write:
if (block) {
/* One or more new blocks were allocated. */
VdiHeader *header = (VdiHeader *) block;
VdiHeader *header;
uint8_t *base;
uint64_t offset;
uint32_t n_sectors;
g_free(block);
header = g_malloc(sizeof(*header));
logout("now writing modified header\n");
assert(VDI_IS_ALLOCATED(bmap_first));
*header = s->header;
vdi_header_to_le(header);
ret = bdrv_pwrite(bs->file, 0, block, sizeof(VdiHeader));
g_free(block);
block = NULL;
ret = bdrv_pwrite(bs->file, 0, header, sizeof(*header));
g_free(header);
if (ret < 0) {
return ret;