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From: Kevin Wolf <kwolf@redhat.com>
To: qemu-devel@nongnu.org
Cc: kwolf@redhat.com, stefanha@redhat.com
Subject: [Qemu-devel] [PATCH 07/20] iscsi: Handle failure for potentially large allocations
Date: Wed, 21 May 2014 18:28:05 +0200	[thread overview]
Message-ID: <1400689698-3096-8-git-send-email-kwolf@redhat.com> (raw)
In-Reply-To: <1400689698-3096-1-git-send-email-kwolf@redhat.com>

Some code in the block layer makes potentially huge allocations. Failure
is not completely unexpected there, so avoid aborting qemu and handle
out-of-memory situations gracefully.

This patch addresses the allocations in the iscsi block driver.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/iscsi.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/block/iscsi.c b/block/iscsi.c
index 52355b8..c047ca8 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -296,7 +296,10 @@ static int coroutine_fn iscsi_co_writev(BlockDriverState *bs,
         data = iov->iov[0].iov_base;
     } else {
         size_t size = MIN(nb_sectors * BDRV_SECTOR_SIZE, iov->size);
-        buf = g_malloc(size);
+        buf = g_try_malloc(size);
+        if (buf == NULL) {
+            return -ENOMEM;
+        }
         qemu_iovec_to_buf(iov, 0, buf, size);
         data = buf;
     }
@@ -550,7 +553,11 @@ static BlockDriverAIOCB *iscsi_aio_ioctl(BlockDriverState *bs,
 #else
             struct iovec *iov = (struct iovec *)acb->ioh->dxferp;
 
-            acb->buf = g_malloc(acb->ioh->dxfer_len);
+            acb->buf = g_try_malloc(acb->ioh->dxfer_len);
+            if (acb->buf == NULL) {
+                qemu_aio_release(acb);
+                return NULL;
+            }
             data.data = acb->buf;
             data.size = iov_to_buf(iov, acb->ioh->iovec_count, 0,
                                    acb->buf, acb->ioh->dxfer_len);
@@ -823,7 +830,10 @@ coroutine_fn iscsi_co_write_zeroes(BlockDriverState *bs, int64_t sector_num,
     nb_blocks = sector_qemu2lun(nb_sectors, iscsilun);
 
     if (iscsilun->zeroblock == NULL) {
-        iscsilun->zeroblock = g_malloc0(iscsilun->block_size);
+        iscsilun->zeroblock = g_try_malloc0(iscsilun->block_size);
+        if (iscsilun->zeroblock == NULL) {
+            return -ENOMEM;
+        }
     }
 
     iscsi_co_init_iscsitask(iscsilun, &iTask);
-- 
1.8.3.1

  parent reply	other threads:[~2014-05-21 16:28 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-05-21 16:27 [Qemu-devel] [PATCH 00/20] block: Handle failure for potentially large allocations Kevin Wolf
2014-05-21 16:27 ` [Qemu-devel] [PATCH 01/20] block: Introduce qemu_try_blockalign() Kevin Wolf
2014-05-22 15:50   ` Stefan Hajnoczi
2014-05-21 16:28 ` [Qemu-devel] [PATCH 02/20] block: Handle failure for potentially large allocations Kevin Wolf
2014-05-22 15:50   ` Stefan Hajnoczi
2014-05-21 16:28 ` [Qemu-devel] [PATCH 03/20] bochs: " Kevin Wolf
2014-05-22 15:52   ` Stefan Hajnoczi
2014-05-21 16:28 ` [Qemu-devel] [PATCH 04/20] cloop: " Kevin Wolf
2014-05-22 15:53   ` Stefan Hajnoczi
2014-05-21 16:28 ` [Qemu-devel] [PATCH 05/20] curl: " Kevin Wolf
2014-05-22 15:54   ` Stefan Hajnoczi
2014-05-21 16:28 ` [Qemu-devel] [PATCH 06/20] dmg: " Kevin Wolf
2014-05-22 15:55   ` Stefan Hajnoczi
2014-05-21 16:28 ` Kevin Wolf [this message]
2014-05-21 20:26   ` [Qemu-devel] [PATCH 07/20] iscsi: " Paolo Bonzini
2014-05-22 15:58   ` Stefan Hajnoczi
2014-05-21 16:28 ` [Qemu-devel] [PATCH 08/20] nfs: " Kevin Wolf
2014-05-22 16:00   ` Stefan Hajnoczi
2014-05-22 16:38   ` ronnie sahlberg
2014-05-21 16:28 ` [Qemu-devel] [PATCH 09/20] parallels: " Kevin Wolf
2014-05-22 16:01   ` Stefan Hajnoczi
2014-05-21 16:28 ` [Qemu-devel] [PATCH 10/20] qcow1: " Kevin Wolf
2014-05-22 16:01   ` Stefan Hajnoczi
2014-05-21 16:28 ` [Qemu-devel] [PATCH 11/20] qcow2: " Kevin Wolf
2014-05-22 16:07   ` Stefan Hajnoczi
2014-05-21 16:28 ` [Qemu-devel] [PATCH 12/20] qed: " Kevin Wolf
2014-05-22 16:08   ` Stefan Hajnoczi
2014-05-21 16:28 ` [Qemu-devel] [PATCH 13/20] raw-posix: " Kevin Wolf
2014-05-22 16:08   ` Stefan Hajnoczi
2014-05-21 16:28 ` [Qemu-devel] [PATCH 14/20] raw-win32: " Kevin Wolf
2014-05-22 16:09   ` Stefan Hajnoczi
2014-05-21 16:28 ` [Qemu-devel] [PATCH 15/20] rbd: " Kevin Wolf
2014-05-22 16:10   ` Stefan Hajnoczi
2014-05-21 16:28 ` [Qemu-devel] [PATCH 16/20] vdi: " Kevin Wolf
2014-05-22 16:10   ` Stefan Hajnoczi
2014-05-21 16:28 ` [Qemu-devel] [PATCH 17/20] vhdx: " Kevin Wolf
2014-05-22 16:11   ` Stefan Hajnoczi
2014-05-21 16:28 ` [Qemu-devel] [PATCH 18/20] vmdk: " Kevin Wolf
2014-05-22 16:11   ` Stefan Hajnoczi
2014-05-21 16:28 ` [Qemu-devel] [PATCH 19/20] vpc: " Kevin Wolf
2014-05-22 16:11   ` Stefan Hajnoczi
2014-05-21 16:28 ` [Qemu-devel] [PATCH 20/20] mirror: " Kevin Wolf
2014-05-22 16:11   ` Stefan Hajnoczi

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