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Commit314aec4a6e("hostmem-file: reject invalid pmem file sizes") added a file size check that verifies the hostmem object's size parameter against the actual devdax pmem file. This is useful because getting the size wrong results in confusing errors inside the guest. However, the code doesn't work properly for files where struct stat::st_size is zero. Hostmem-file's ->alloc() function returns early without setting an Error, causing the following assertion failure: qemu/memory.c:2215: memory_region_get_ram_ptr: Assertion `mr->ram_block' failed. This patch handles the case where qemu_get_pmem_size() returns 0 but there is no error. Fixes:314aec4a6eSigned-off-by: Stefan Hajnoczi <stefanha@redhat.com> Message-Id: <20190823135632.25010-1-stefanha@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>