From 50d4a858e62b1d864227d13f07d2c79c118d046a Mon Sep 17 00:00:00 2001 From: Kevin Wolf Date: Wed, 21 May 2014 18:02:42 +0200 Subject: [PATCH] raw-posix: 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 raw-posix block driver. Signed-off-by: Kevin Wolf Reviewed-by: Stefan Hajnoczi --- block/raw-posix.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/block/raw-posix.c b/block/raw-posix.c index 8e9758e920ab..1194eb00ad27 100644 --- a/block/raw-posix.c +++ b/block/raw-posix.c @@ -798,7 +798,11 @@ static ssize_t handle_aiocb_rw(RawPosixAIOData *aiocb) * Ok, we have to do it the hard way, copy all segments into * a single aligned buffer. */ - buf = qemu_blockalign(aiocb->bs, aiocb->aio_nbytes); + buf = qemu_try_blockalign(aiocb->bs, aiocb->aio_nbytes); + if (buf == NULL) { + return -ENOMEM; + } + if (aiocb->aio_type & QEMU_AIO_WRITE) { char *p = buf; int i;