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[Qemu-block] [PATCH v2] util/async: avoid NULL pointer dereference
From: |
Jie Wang |
Subject: |
[Qemu-block] [PATCH v2] util/async: avoid NULL pointer dereference |
Date: |
Tue, 12 Jun 2018 07:26:25 +0800 |
if laio_init create linux_aio failed and return NULL, NULL pointer
dereference will occur when laio_attach_aio_context dereference
linux_aio in aio_get_linux_aio. Let's avoid it and report error.
Signed-off-by: Jie Wang <address@hidden>
---
block/file-posix.c | 19 +++++++++++++++++--
util/async.c | 5 ++++-
2 files changed, 21 insertions(+), 3 deletions(-)
diff --git a/block/file-posix.c b/block/file-posix.c
index 513d371bb1..653017d7a5 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -1665,6 +1665,11 @@ static int coroutine_fn raw_co_prw(BlockDriverState *bs,
uint64_t offset,
#ifdef CONFIG_LINUX_AIO
} else if (s->use_linux_aio) {
LinuxAioState *aio = aio_get_linux_aio(bdrv_get_aio_context(bs));
+ if (!aio) {
+ s->use_linux_aio = false;
+ error_report("Failed to get linux aio");
+ return -EIO;
+ }
assert(qiov->size == bytes);
return laio_co_submit(bs, aio, s->fd, offset, qiov, type);
#endif
@@ -1695,7 +1700,12 @@ static void raw_aio_plug(BlockDriverState *bs)
BDRVRawState *s = bs->opaque;
if (s->use_linux_aio) {
LinuxAioState *aio = aio_get_linux_aio(bdrv_get_aio_context(bs));
- laio_io_plug(bs, aio);
+ if (aio) {
+ laio_io_plug(bs, aio);
+ } else {
+ s->use_linux_aio = false;
+ error_report("Failed to get linux aio");
+ }
}
#endif
}
@@ -1706,7 +1716,12 @@ static void raw_aio_unplug(BlockDriverState *bs)
BDRVRawState *s = bs->opaque;
if (s->use_linux_aio) {
LinuxAioState *aio = aio_get_linux_aio(bdrv_get_aio_context(bs));
- laio_io_unplug(bs, aio);
+ if (aio) {
+ laio_io_unplug(bs, aio);
+ } else {
+ s->use_linux_aio = false;
+ error_report("Failed to get linux aio");
+ }
}
#endif
}
diff --git a/util/async.c b/util/async.c
index 03f62787f2..08d71340f8 100644
--- a/util/async.c
+++ b/util/async.c
@@ -327,8 +327,11 @@ LinuxAioState *aio_get_linux_aio(AioContext *ctx)
{
if (!ctx->linux_aio) {
ctx->linux_aio = laio_init();
- laio_attach_aio_context(ctx->linux_aio, ctx);
+ if (ctx->linux_aio) {
+ laio_attach_aio_context(ctx->linux_aio, ctx);
+ }
}
+
return ctx->linux_aio;
}
#endif
--
2.15.0.windows.1