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[Qemu-devel] [PULL 09/12] block: mirror - change string allocation to 2-
From: |
Kevin Wolf |
Subject: |
[Qemu-devel] [PULL 09/12] block: mirror - change string allocation to 2-bytes |
Date: |
Fri, 23 Jan 2015 19:20:15 +0100 |
From: Jeff Cody <address@hidden>
The backing_filename string in mirror_run() is only used to check
for a NULL string, so we don't need to allocate 1024 bytes (or, later,
PATH_MAX bytes), when we only need to copy the first 2 characters.
We technically only need 1 byte, as we are just checking for NULL, but
since backing_filename[] is populated by bdrv_get_backing_filename(), a
string size of 1 will always only return '\0';
Reviewed-by: Stefan Hajnoczi <address@hidden>
Reviewed-by: John Snow <address@hidden>
Signed-off-by: Jeff Cody <address@hidden>
Signed-off-by: Kevin Wolf <address@hidden>
---
block/mirror.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/block/mirror.c b/block/mirror.c
index 9019d1b..4056164 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -378,7 +378,8 @@ static void coroutine_fn mirror_run(void *opaque)
int64_t sector_num, end, sectors_per_chunk, length;
uint64_t last_pause_ns;
BlockDriverInfo bdi;
- char backing_filename[1024];
+ char backing_filename[2]; /* we only need 2 characters because we are only
+ checking for a NULL string */
int ret = 0;
int n;
--
1.8.3.1
- [Qemu-devel] [PULL 00/12] Block patches, Kevin Wolf, 2015/01/23
- [Qemu-devel] [PULL 01/12] virtio-blk: Pass req to virtio_blk_handle_scsi_req, Kevin Wolf, 2015/01/23
- [Qemu-devel] [PULL 04/12] iotests: Add tests for more corruption cases, Kevin Wolf, 2015/01/23
- [Qemu-devel] [PULL 05/12] block: vmdk - make ret variable usage clear, Kevin Wolf, 2015/01/23
- [Qemu-devel] [PULL 02/12] virtio-blk: Use blk_aio_ioctl, Kevin Wolf, 2015/01/23
- [Qemu-devel] [PULL 06/12] block: vmdk - move string allocations from stack to the heap, Kevin Wolf, 2015/01/23
- [Qemu-devel] [PULL 03/12] qcow2: Add two more unalignment checks, Kevin Wolf, 2015/01/23
- [Qemu-devel] [PULL 08/12] block: remove unused variable in bdrv_commit, Kevin Wolf, 2015/01/23
- [Qemu-devel] [PULL 11/12] block: vhdx - force FileOffsetMB field to '0' for certain block states, Kevin Wolf, 2015/01/23
- [Qemu-devel] [PULL 12/12] iotests: Lower 064's memory usage, Kevin Wolf, 2015/01/23
- [Qemu-devel] [PULL 09/12] block: mirror - change string allocation to 2-bytes,
Kevin Wolf <=
- [Qemu-devel] [PULL 10/12] block: update string sizes for filename, backing_file, exact_filename, Kevin Wolf, 2015/01/23
- [Qemu-devel] [PULL 07/12] block: qapi - move string allocation from stack to the heap, Kevin Wolf, 2015/01/23
- Re: [Qemu-devel] [PULL 00/12] Block patches, Peter Maydell, 2015/01/26