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[Qemu-devel] [PULL 58/61] blkdebug: Catch bs->exact_filename overflow
From: |
Kevin Wolf |
Subject: |
[Qemu-devel] [PULL 58/61] blkdebug: Catch bs->exact_filename overflow |
Date: |
Fri, 23 Jun 2017 18:21:56 +0200 |
From: Max Reitz <address@hidden>
The bs->exact_filename field may not be sufficient to store the full
blkdebug node filename. In this case, we should not generate a filename
at all instead of an unusable one.
Cc: address@hidden
Reported-by: Qu Wenruo <address@hidden>
Signed-off-by: Max Reitz <address@hidden>
Message-id: address@hidden
Reviewed-by: Alberto Garcia <address@hidden>
Reviewed-by: Stefan Hajnoczi <address@hidden>
Signed-off-by: Max Reitz <address@hidden>
---
block/blkdebug.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/block/blkdebug.c b/block/blkdebug.c
index 6431962..a1b24b9 100644
--- a/block/blkdebug.c
+++ b/block/blkdebug.c
@@ -839,9 +839,13 @@ static void blkdebug_refresh_filename(BlockDriverState
*bs, QDict *options)
}
if (!force_json && bs->file->bs->exact_filename[0]) {
- snprintf(bs->exact_filename, sizeof(bs->exact_filename),
- "blkdebug:%s:%s", s->config_file ?: "",
- bs->file->bs->exact_filename);
+ int ret = snprintf(bs->exact_filename, sizeof(bs->exact_filename),
+ "blkdebug:%s:%s", s->config_file ?: "",
+ bs->file->bs->exact_filename);
+ if (ret >= sizeof(bs->exact_filename)) {
+ /* An overflow makes the filename unusable, so do not report any */
+ bs->exact_filename[0] = 0;
+ }
}
opts = qdict_new();
--
1.8.3.1
- [Qemu-devel] [PULL 42/61] qed: Add return value to qed_aio_write_l2_update(), (continued)
- [Qemu-devel] [PULL 42/61] qed: Add return value to qed_aio_write_l2_update(), Kevin Wolf, 2017/06/23
- [Qemu-devel] [PULL 44/61] qed: Add return value to qed_aio_write_cow(), Kevin Wolf, 2017/06/23
- [Qemu-devel] [PULL 50/61] qed: Use CoQueue for serialising allocations, Kevin Wolf, 2017/06/23
- [Qemu-devel] [PULL 49/61] qed: Implement .bdrv_co_readv/writev, Kevin Wolf, 2017/06/23
- [Qemu-devel] [PULL 51/61] qed: Simplify request handling, Kevin Wolf, 2017/06/23
- [Qemu-devel] [PULL 52/61] qed: Use a coroutine for need_check_timer, Kevin Wolf, 2017/06/23
- [Qemu-devel] [PULL 54/61] qed: Use bdrv_co_* for coroutine_fns, Kevin Wolf, 2017/06/23
- [Qemu-devel] [PULL 53/61] qed: Add coroutine_fn to I/O path functions, Kevin Wolf, 2017/06/23
- [Qemu-devel] [PULL 57/61] fix: avoid an infinite loop or a dangling pointer problem in img_commit, Kevin Wolf, 2017/06/23
- [Qemu-devel] [PULL 55/61] block: Remove bdrv_aio_readv/writev/flush(), Kevin Wolf, 2017/06/23
- [Qemu-devel] [PULL 58/61] blkdebug: Catch bs->exact_filename overflow,
Kevin Wolf <=
- [Qemu-devel] [PULL 61/61] qemu-img: don't shadow opts variable in img_dd(), Kevin Wolf, 2017/06/23
- [Qemu-devel] [PULL 59/61] blkverify: Catch bs->exact_filename overflow, Kevin Wolf, 2017/06/23
- [Qemu-devel] [PULL 60/61] block: Do not strcmp() with NULL uri->scheme, Kevin Wolf, 2017/06/23
- [Qemu-devel] [PULL 56/61] block: change variable names in BlockDriverState, Kevin Wolf, 2017/06/23
- Re: [Qemu-devel] [PULL 00/61] Block layer patches, Peter Maydell, 2017/06/26