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| author | Tomáš Golembiovský <tgolembi@redhat.com> | 2016-10-05 23:40:20 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-10-06 18:04:13 +0200 |
| commit | e424b6550f486b2a9ab32b13c3824021199bac54 (patch) | |
| tree | 3cd45550b2276e87a281ffe6adbc1f2b4f535dd6 | |
| parent | fbe7e3327a8cfa1b08664c2cda7a0a341cf0530a (diff) | |
qemu-nbd: Shrink image size by specified offset
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 <tgolembi@redhat.com>
Message-Id: <8a31654cb182932db78b95aae1e904fc2bd1c465.1475698895.git.tgolembi@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | qemu-nbd.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/qemu-nbd.c b/qemu-nbd.c index 99297a556f..705b95ec29 100644 --- a/qemu-nbd.c +++ b/qemu-nbd.c @@ -901,6 +901,14 @@ int main(int argc, char **argv) exit(EXIT_FAILURE); } + if (dev_offset >= fd_size) { + error_report("Offset (%lld) has to be smaller than the image size " + "(%lld)", + (long long int)dev_offset, (long long int)fd_size); + exit(EXIT_FAILURE); + } + fd_size -= dev_offset; + if (partition != -1) { ret = find_partition(blk, partition, &dev_offset, &fd_size); if (ret < 0) { |