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* [PATCH 1/1] libxl: Fix uninitialized pointer when passing an empty cdrom
@ 2016-04-06 11:34 George Dunlap
  2016-04-06 12:10 ` Andrew Cooper
  0 siblings, 1 reply; 3+ messages in thread
From: George Dunlap @ 2016-04-06 11:34 UTC (permalink / raw)
  To: xen-devel; +Cc: Ian Jackson, Wei Liu, George Dunlap, Andrew Cooper

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) {

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end of thread, other threads:[~2016-04-06 13:47 UTC | newest]

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2016-04-06 11:34 [PATCH 1/1] libxl: Fix uninitialized pointer when passing an empty cdrom George Dunlap
2016-04-06 12:10 ` Andrew Cooper
2016-04-06 13:47   ` Ian Jackson

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