From: George Dunlap <george.dunlap@citrix.com>
To: xen-devel@lists.xen.org
Cc: Ian Jackson <ian.jackson@citrix.com>,
Wei Liu <wei.liu2@citrix.com>,
George Dunlap <george.dunlap@citrix.com>,
Andrew Cooper <andrew.cooper3@citrix.com>
Subject: [PATCH 1/1] libxl: Fix uninitialized pointer when passing an empty cdrom
Date: Wed, 6 Apr 2016 12:34:06 +0100 [thread overview]
Message-ID: <1459942446-25008-1-git-send-email-george.dunlap@citrix.com> (raw)
Commit 3fec17d4bb56567d139d7806392f4d8702d3f6a7 introduced a bug where
an empty cdrom would cause target_path to be uninitialized. Initialize
target_path to NULL instead.
The other option here would have been to set target_path to NULL only
on the LIBXL_DISK_FORMAT_EMPTY path. That would potentially enable
the compiler to catch future uninitialized paths, rather than having
those paths (potentially) dereference a NULL pointer. But given that
a bunch of our compilers failed to catch *this* uninitialized path,
setting it to NULL at declaration seems the safer option for now.
Reported-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: George Dunlap <george.dunlap@citrix.com>
---
CC: Ian Jackson <ian.jackson@citrix.com>
CC: Wei Liu <wei.liu2@citrix.com>
CC: Andrew Cooper <andrew.cooper3@citrix.com>
---
tools/libxl/libxl_dm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/libxl/libxl_dm.c b/tools/libxl/libxl_dm.c
index 5b79aa2..eac5501 100644
--- a/tools/libxl/libxl_dm.c
+++ b/tools/libxl/libxl_dm.c
@@ -1307,7 +1307,7 @@ static int libxl__build_device_model_args_new(libxl__gc *gc,
libxl__device_disk_dev_number(disks[i].vdev, &disk, &part);
const char *format;
char *drive;
- const char *target_path;
+ const char *target_path = NULL;
int colo_mode;
if (dev_number == -1) {
--
2.1.4
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next reply other threads:[~2016-04-06 11:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-06 11:34 George Dunlap [this message]
2016-04-06 12:10 ` [PATCH 1/1] libxl: Fix uninitialized pointer when passing an empty cdrom Andrew Cooper
2016-04-06 13:47 ` Ian Jackson
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