From: Kevin Wolf <kwolf@redhat.com>
Date: Tue, 20 May 2014 11:31:20 +0000 (+0200)
Subject: nfs: Handle failure for potentially large allocations
X-Git-Tag: TizenStudio_2.0_p2.3.2~208^2~656^2~16
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2347dd7b6841c1543ceb49cb232d596eb5dd1ca3;p=sdk%2Femulator%2Fqemu.git

nfs: Handle failure for potentially large allocations

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 nfs block driver.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Benoit Canet <benoit@irqsave.net>
---

diff --git a/block/nfs.c b/block/nfs.c
index 8439e0d..fe46c33 100644
--- a/block/nfs.c
+++ b/block/nfs.c
@@ -172,7 +172,11 @@ static int coroutine_fn nfs_co_writev(BlockDriverState *bs,
 
     nfs_co_init_task(client, &task);
 
-    buf = g_malloc(nb_sectors * BDRV_SECTOR_SIZE);
+    buf = g_try_malloc(nb_sectors * BDRV_SECTOR_SIZE);
+    if (nb_sectors && buf == NULL) {
+        return -ENOMEM;
+    }
+
     qemu_iovec_to_buf(iov, 0, buf, nb_sectors * BDRV_SECTOR_SIZE);
 
     if (nfs_pwrite_async(client->context, client->fh,