99b5b999a4
Commit 4472beae modified the semantics of ioreq_{un,}map so that they are
idempotent if called when they're not needed (ie., twice in a row). However,
it neglected to handle the case where batch mapping is not being used (the
default), and one of the grants fails to map. In this case, ioreq_unmap will
be called to unwind and unmap any mappings already performed, but ioreq_unmap
simply returns due to the aforementioned change (the ioreq has not already
been marked as mapped).
The frontend user can therefore force xen_disk to leak grant mappings, a
per-domain limited resource.
Fix by marking the ioreq as mapped before calling ioreq_unmap in this
situation.
Signed-off-by: Matthew Daley <mattjd@gmail.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
(cherry picked from commit
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| .. | ||
| dataplane | ||
| Makefile.objs | ||
| block.c | ||
| cdrom.c | ||
| ecc.c | ||
| fdc.c | ||
| hd-geometry.c | ||
| m25p80.c | ||
| nand.c | ||
| nvme.c | ||
| nvme.h | ||
| onenand.c | ||
| pflash_cfi01.c | ||
| pflash_cfi02.c | ||
| tc58128.c | ||
| virtio-blk.c | ||
| xen_blkif.h | ||
| xen_disk.c | ||