From: Kevin Wolf <kwolf@redhat.com>
To: qemu-devel@nongnu.org
Cc: kwolf@redhat.com, stefanha@redhat.com
Subject: [Qemu-devel] [PATCH 17/20] vhdx: Handle failure for potentially large allocations
Date: Wed, 21 May 2014 18:28:15 +0200 [thread overview]
Message-ID: <1400689698-3096-18-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 vhdx block driver.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
block/vhdx-log.c | 6 +++++-
block/vhdx.c | 12 ++++++++++--
2 files changed, 15 insertions(+), 3 deletions(-)
diff --git a/block/vhdx-log.c b/block/vhdx-log.c
index a77c040..3eb7e68 100644
--- a/block/vhdx-log.c
+++ b/block/vhdx-log.c
@@ -349,7 +349,11 @@ static int vhdx_log_read_desc(BlockDriverState *bs, BDRVVHDXState *s,
}
desc_sectors = vhdx_compute_desc_sectors(hdr.descriptor_count);
- desc_entries = qemu_blockalign(bs, desc_sectors * VHDX_LOG_SECTOR_SIZE);
+ desc_entries = qemu_try_blockalign(bs, desc_sectors * VHDX_LOG_SECTOR_SIZE);
+ if (desc_entries == NULL) {
+ ret = -ENOMEM;
+ goto exit;
+ }
ret = vhdx_log_read_sectors(bs, log, §ors_read, desc_entries,
desc_sectors, false);
diff --git a/block/vhdx.c b/block/vhdx.c
index 353c74d..0922f55 100644
--- a/block/vhdx.c
+++ b/block/vhdx.c
@@ -950,7 +950,11 @@ static int vhdx_open(BlockDriverState *bs, QDict *options, int flags,
}
/* s->bat is freed in vhdx_close() */
- s->bat = qemu_blockalign(bs, s->bat_rt.length);
+ s->bat = qemu_try_blockalign(bs, s->bat_rt.length);
+ if (s->bat == NULL) {
+ ret = -ENOMEM;
+ goto fail;
+ }
ret = bdrv_pread(bs->file, s->bat_offset, s->bat, s->bat_rt.length);
if (ret < 0) {
@@ -1579,7 +1583,11 @@ static int vhdx_create_bat(BlockDriverState *bs, BDRVVHDXState *s,
use_zero_blocks ||
bdrv_has_zero_init(bs) == 0) {
/* for a fixed file, the default BAT entry is not zero */
- s->bat = g_malloc0(rt_bat->length);
+ s->bat = g_try_malloc0(rt_bat->length);
+ if (rt_bat->length && s->bat != NULL) {
+ ret = -ENOMEM;
+ goto exit;
+ }
block_state = type == VHDX_TYPE_FIXED ? PAYLOAD_BLOCK_FULLY_PRESENT :
PAYLOAD_BLOCK_NOT_PRESENT;
block_state = use_zero_blocks ? PAYLOAD_BLOCK_ZERO : block_state;
--
1.8.3.1
next prev parent reply other threads:[~2014-05-21 16:29 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 ` [Qemu-devel] [PATCH 07/20] iscsi: " Kevin Wolf
2014-05-21 20:26 ` 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 ` Kevin Wolf [this message]
2014-05-22 16:11 ` [Qemu-devel] [PATCH 17/20] vhdx: " 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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1400689698-3096-18-git-send-email-kwolf@redhat.com \
--to=kwolf@redhat.com \
--cc=qemu-devel@nongnu.org \
--cc=stefanha@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).