From 9cde9caa04beac25cef32a8a9d0bd26d6b91a41a Mon Sep 17 00:00:00 2001 From: Markus Armbruster Date: Tue, 30 Jun 2020 11:03:51 +0200 Subject: [PATCH] migration/rdma: Plug memory leaks in qemu_rdma_registration_stop() qemu_rdma_registration_stop() uses the ERROR() macro to create, report to stderr, and store an Error object. The stored Error object is never used, and its memory is leaked. Even where ERROR() doesn't leak, it is ill-advised. The whole point of passing an Error to the caller is letting the caller handle the error. Error handling may report to stderr, to somewhere else, or not at all. Also reporting in the callee mixes up concerns that should be kept separate. Since I don't know what reporting to stderr is supposed to accomplish, I'm not touching it. Commit 2a1bc8bde7 "migration/rdma: rdma_accept_incoming_migration fix error handling" plugged the same leak in rdma_accept_incoming_migration(). Plug the memory leak the same way: keep the report part, delete the store part. The report part uses fprintf(). If it's truly an error, it should use error_report() instead. But I don't know, so I leave it alone, just like commit 2a1bc8bde7 did. Fixes: 2da776db4846eadcb808598a5d3484d149773c05 Cc: Dr. David Alan Gilbert Cc: Juan Quintela Signed-off-by: Markus Armbruster Message-Id: <20200630090351.1247703-27-armbru@redhat.com> Reviewed-by: Dr. David Alan Gilbert --- migration/rdma.c | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) diff --git a/migration/rdma.c b/migration/rdma.c index ec45d33ba3..3b18823268 100644 --- a/migration/rdma.c +++ b/migration/rdma.c @@ -3787,7 +3787,6 @@ static int qemu_rdma_registration_start(QEMUFile *f, void *opaque, static int qemu_rdma_registration_stop(QEMUFile *f, void *opaque, uint64_t flags, void *data) { - Error *local_err = NULL, **errp = &local_err; QIOChannelRDMA *rioc = QIO_CHANNEL_RDMA(opaque); RDMAContext *rdma; RDMAControlHeader head = { .len = 0, .repeat = 1 }; @@ -3832,7 +3831,7 @@ static int qemu_rdma_registration_stop(QEMUFile *f, void *opaque, ®_result_idx, rdma->pin_all ? qemu_rdma_reg_whole_ram_blocks : NULL); if (ret < 0) { - ERROR(errp, "receiving remote info!"); + fprintf(stderr, "receiving remote info!"); return ret; } @@ -3851,10 +3850,10 @@ static int qemu_rdma_registration_stop(QEMUFile *f, void *opaque, */ if (local->nb_blocks != nb_dest_blocks) { - ERROR(errp, "ram blocks mismatch (Number of blocks %d vs %d) " - "Your QEMU command line parameters are probably " - "not identical on both the source and destination.", - local->nb_blocks, nb_dest_blocks); + fprintf(stderr, "ram blocks mismatch (Number of blocks %d vs %d) " + "Your QEMU command line parameters are probably " + "not identical on both the source and destination.", + local->nb_blocks, nb_dest_blocks); rdma->error_state = -EINVAL; return -EINVAL; } @@ -3867,10 +3866,10 @@ static int qemu_rdma_registration_stop(QEMUFile *f, void *opaque, /* We require that the blocks are in the same order */ if (rdma->dest_blocks[i].length != local->block[i].length) { - ERROR(errp, "Block %s/%d has a different length %" PRIu64 - "vs %" PRIu64, local->block[i].block_name, i, - local->block[i].length, - rdma->dest_blocks[i].length); + fprintf(stderr, "Block %s/%d has a different length %" PRIu64 + "vs %" PRIu64, local->block[i].block_name, i, + local->block[i].length, + rdma->dest_blocks[i].length); rdma->error_state = -EINVAL; return -EINVAL; } -- 2.11.4.GIT