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vmdk: Don't corrupt desc file in vmdk_write_cid
If the text description file is larger than DESC_SIZE, we force the last byte in the buffer to be 0 and write it out. This results in a corruption. Try to allocate a big buffer in this case. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1923 Signed-off-by: Fam Zheng <fam@euphon.net> Message-ID: <20231124115654.3239137-1-fam@euphon.net> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com> (cherry picked from commit 9fb7b35) Signed-off-by: Michael Tokarev <mjt@tls.msk.ru> (Mjt: fixups in block/vmdk.c due to missing-in-7.2 v8.0.0-2084-g28944f99c4 "vmdk: mark more functions as coroutine_fns and GRAPH_RDLOCK")
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