[Xen-devel] [PATCH 2/4] libxenstat: YAJL_GET_STRING may return NULL

[Wei Liu <wei.liu2@xxxxxxxxxx>]

Passing NULL to strcmp can cause segmentation fault. Continue in that
case.

Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Charles Arnold <carnold@xxxxxxxx>
---
 tools/xenstat/libxenstat/src/xenstat_qmp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/xenstat/libxenstat/src/xenstat_qmp.c 
b/tools/xenstat/libxenstat/src/xenstat_qmp.c
index f3aeec4..6bfbc2f 100644
--- a/tools/xenstat/libxenstat/src/xenstat_qmp.c
+++ b/tools/xenstat/libxenstat/src/xenstat_qmp.c
@@ -110,7 +110,7 @@ static char *qmp_get_block_image(xenstat_node *node, char 
*qmp_devname, int qfd)
                ptr[0] = qblock[QMP_BLOCK_DEVICE]; /* "device" */
                if ((dev_obj = yajl_tree_get(n, ptr, yajl_t_any)) != NULL) {
                        tmp = YAJL_GET_STRING(dev_obj);
-                       if (strcmp(qmp_devname, tmp))
+                       if (!tmp || strcmp(qmp_devname, tmp))
                                continue;
                }
                else
-- 
1.9.1


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