When --offset is set the apparent device size has to be adjusted
accordingly. Otherwise client may request read/write beyond the file end
which would fail.
Signed-off-by: Tomáš Golembiovský <tgole...@redhat.com>
---
qemu-nbd.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/qemu-nbd.c b/qemu-nbd.c
index 99297a5..629bce1 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -901,6 +901,13 @@ int main(int argc, char **argv)
exit(EXIT_FAILURE);
}
+ if (dev_offset >= fd_size) {
+ error_report("Offset (%lu) has to be smaller than the image size
(%lu)",
+ dev_offset, fd_size);
+ exit(EXIT_FAILURE);
+ }
+ fd_size -= dev_offset;
+
if (partition != -1) {
ret = find_partition(blk, partition, &dev_offset, &fd_size);
if (ret < 0) {
--
2.9.3
