nbd-server: do not exit on failed memory allocation

The amount of memory allocated in nbd_co_receive_request is driven by the
NBD client (possibly a virtual machine).  Parallel I/O can cause the
server to allocate a large amount of memory; check for failures and
return ENOMEM in that case.

Cc: qemu-block@nongnu.org
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/block/block-backend.c b/block/block-backend.c
index f41d326b3c..e81375955f 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -1033,6 +1033,11 @@ void blk_set_guest_block_size(BlockBackend *blk, int align)
     blk->guest_block_size = align;
 }
 
+void *blk_try_blockalign(BlockBackend *blk, size_t size)
+{
+    return qemu_try_blockalign(blk ? blk->bs : NULL, size);
+}
+
 void *blk_blockalign(BlockBackend *blk, size_t size)
 {
     return qemu_blockalign(blk ? blk->bs : NULL, size);