Re: [libvirt] [PATCH] virsh: fix memory leak in cmdVolPath code

* tools/virsh.c: avoid memory leak in cmdVolPath. * how to reproduce? % dd if=/dev/zero of=/var/lib/libvirt/images/foo.img count=1 bs=10M % virsh pool-refresh default % valgrind -v --leak-check=full virsh vol-path --vol /var/lib/libvirt/images/foo.img * actual results: Detected in valgrind run: ==16436== 32 bytes in 1 blocks are definitely lost in loss record 7 of 22 ==16436== at 0x4A05FDE: malloc (vg_replace_malloc.c:236) ==16436== by 0x386A314B3D: xdr_string (in /lib64/libc-2.12.so) ==16436== by 0x3DF8CD770D: xdr_remote_nonnull_string (remote_protocol.c:30) ==16436== by 0x3DF8CD7EC8: xdr_remote_storage_vol_get_path_ret (remote_protocol.c:2952) ==16436== by 0x3DF8CDF161: virNetMessageDecodePayload (virnetmessage.c:286) ==16436== by 0x3DF8CDE9E5: virNetClientProgramCall (virnetclientprogram.c:318) ==16436== by 0x3DF8CC28A2: call (remote_driver.c:3929) ==16436== by 0x3DF8CC8412: remoteStorageVolGetPath (remote_client_bodies.h:5219) ==16436== by 0x3DF8C9BF14: virStorageVolGetPath (libvirt.c:11389) ==16436== by 0x418ECA: cmdVolPath (virsh.c:8754) ==16436== by 0x410CC2: vshCommandRun (virsh.c:12758) ==16436== by 0x41F286: main (virsh.c:14110) ==16436== ==16436== LEAK SUMMARY: ==16436== definitely lost: 32 bytes in 1 blocks Signed-off-by: Alex Jia<ajia(a)redhat.com> --- tools/virsh.c | 9 ++++++++- 1 files changed, 8 insertions(+), 1 deletions(-) diff --git a/tools/virsh.c b/tools/virsh.c index 841df61..d194a8b 100644 --- a/tools/virsh.c +++ b/tools/virsh.c @@ -9326,6 +9326,7 @@ cmdVolPath(vshControl *ctl, const vshCmd *cmd) { virStorageVolPtr vol; const char *name = NULL; + char * StorageVolPath; if (!vshConnectionUsability(ctl, ctl->conn)) return false; @@ -9334,7 +9335,13 @@ cmdVolPath(vshControl *ctl, const vshCmd *cmd) return false; } - vshPrint(ctl, "%s\n", virStorageVolGetPath(vol)); + if ((StorageVolPath = virStorageVolGetPath(vol)) == NULL) { + virStorageVolFree(vol); + return false; + } + + vshPrint(ctl, "%s\n", StorageVolPath); + VIR_FREE(StorageVolPath); virStorageVolFree(vol); return true; }