[libvirt] [ruby-libvirt] Don't free more entries than we retrieved

The vir*List* functions return the number of fetched entries. We mustn't free more, otherwise we'll crash like #0 0xb779d424 in __kernel_vsyscall () #1 0xb733981f in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56 #2 0xb733ccd3 in __GI_abort () at abort.c:90 #3 0xb7376275 in __libc_message (do_abort=do_abort@entry=2, fmt=fmt@entry=0xb74767d0 "*** Error in `%s': %s: 0x%s ***\n") at ../sysdeps/unix/sysv/linux/libc_fatal.c:199 #4 0xb7380e52 in malloc_printerr (action=<optimized out>, str=<optimized out>, ptr=0xb7087000) at malloc.c:4923 #5 0xb7381b90 in _int_free (av=0xb74b7440 <main_arena>, p=0xb7086ff8, have_lock=0) at malloc.c:3779 #6 0xb75c059f in ruby_xfree () from /usr/lib/libruby-1.9.1.so.1.9 #7 0xb7076448 in ruby_libvirt_generate_list () from /usr/lib/ruby/vendor_ruby/1.9.1/i486-linux/_libvirt.so ... since we're trying to free random addresses. --- ext/libvirt/connect.c | 4 ++-- ext/libvirt/domain.c | 2 +- ext/libvirt/nodedevice.c | 2 +- ext/libvirt/storage.c | 2 +- 4 files changed, 5 insertions(+), 5 deletions(-) diff --git a/ext/libvirt/connect.c b/ext/libvirt/connect.c index 36cac20..1af64a1 100644 --- a/ext/libvirt/connect.c +++ b/ext/libvirt/connect.c @@ -67,7 +67,7 @@ names = alloca(sizeof(char *) * num); \ r = virConnectList##objs(ruby_libvirt_connect_get(c), names, num); \ ruby_libvirt_raise_error_if(r < 0, e_RetrieveError, "virConnectList" # objs, ruby_libvirt_connect_get(c)); \ - return ruby_libvirt_generate_list(num, names); \ + return ruby_libvirt_generate_list(r < 0 ? 0 : r, names); \ } while(0) static VALUE c_connect; @@ -1508,7 +1508,7 @@ static VALUE libvirt_connect_list_nodedevices(int argc, VALUE *argv, VALUE c) ruby_libvirt_raise_error_if(r < 0, e_RetrieveError, "virNodeListDevices", ruby_libvirt_connect_get(c)); - return ruby_libvirt_generate_list(num, names); + return ruby_libvirt_generate_list(r < 0 ? 0 : r, names); } /* diff --git a/ext/libvirt/domain.c b/ext/libvirt/domain.c index ddce2d8..bc46753 100644 --- a/ext/libvirt/domain.c +++ b/ext/libvirt/domain.c @@ -1532,7 +1532,7 @@ static VALUE libvirt_domain_list_snapshots(int argc, VALUE *argv, VALUE d) "virDomainSnapshotListNames", ruby_libvirt_connect_get(d)); - return ruby_libvirt_generate_list(num, names); + return ruby_libvirt_generate_list(r < 0 ? 0 : r, names); } /* diff --git a/ext/libvirt/nodedevice.c b/ext/libvirt/nodedevice.c index 98b3715..041cda2 100644 --- a/ext/libvirt/nodedevice.c +++ b/ext/libvirt/nodedevice.c @@ -124,7 +124,7 @@ static VALUE libvirt_nodedevice_list_caps(VALUE c) "virNodeDeviceListCaps", ruby_libvirt_connect_get(c)); - return ruby_libvirt_generate_list(num, names); + return ruby_libvirt_generate_list(r < 0 ? 0 : r, names); } /* diff --git a/ext/libvirt/storage.c b/ext/libvirt/storage.c index 4b96d2e..008410a 100644 --- a/ext/libvirt/storage.c +++ b/ext/libvirt/storage.c @@ -340,7 +340,7 @@ static VALUE libvirt_storage_pool_list_volumes(VALUE p) "virStoragePoolListVolumes", ruby_libvirt_connect_get(p)); - return ruby_libvirt_generate_list(num, names); + return ruby_libvirt_generate_list(r < 0 ? 0 : r, names); } /* -- 1.8.5.2