| Message ID | 20180322133337.28024-1-yuchenlin@synology.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 2018-03-22 14:33, yuchenlin@synology.com wrote: > From: yuchenlin <yuchenlin@synology.com> > > VMDK has a hard limitation of extent size, which is due to the size of grain > table entry is 32 bits. It means it can only point to a grain located at > offset = 2^32. To avoid writing the user data beyond limitation and record a useless offset > in grain table. We should return ERROR here. > > Signed-off-by: yuchenlin <yuchenlin@synology.com> > --- > v2->v3: > - use (1ULL << 32) to clearly show the limitation of offset is 2^32. > > thanks > > block/vmdk.c | 6 ++++++ > 1 file changed, 6 insertions(+) Thanks, applied to my block branch: https://github.com/XanClic/qemu/commits/block Max
diff --git a/block/vmdk.c b/block/vmdk.c index f94c49a9c0..84f8bbe480 100644 --- a/block/vmdk.c +++ b/block/vmdk.c @@ -47,6 +47,8 @@ #define VMDK4_FLAG_MARKER (1 << 17) #define VMDK4_GD_AT_END 0xffffffffffffffffULL +#define VMDK_EXTENT_MAX_SECTORS (1ULL << 32) + #define VMDK_GTE_ZEROED 0x1 /* VMDK internal error codes */ @@ -1250,6 +1252,10 @@ static int get_cluster_offset(BlockDriverState *bs, return zeroed ? VMDK_ZEROED : VMDK_UNALLOC; } + if (extent->next_cluster_sector >= VMDK_EXTENT_MAX_SECTORS) { + return VMDK_ERROR; + } + cluster_sector = extent->next_cluster_sector; extent->next_cluster_sector += extent->cluster_sectors;