[PATCH mtd-utils] ffsX-utils: Fix integer overflow in jffs2reader.c

[Anton Moryakov]

Report of the static analyzer:
Pointer 'path', returned from function 'xstrdup' at jffs2reader.c:690, may be NULL and is dereferenced at jffs2reader.c:692.

Corrections explained:
After calling xstrdup(p), a path == NULL check has been added. This prevents a possible NULL pointer dereference in the event of a memory allocation error.

Triggers found by static analyzer Svace.

Signed-off-by: Anton Moryakov <ant.v.moryakov at gmail.com>

---
 jffsX-utils/jffs2reader.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/jffsX-utils/jffs2reader.c b/jffsX-utils/jffs2reader.c
index 87a2167..f776466 100644
--- a/jffsX-utils/jffs2reader.c
+++ b/jffsX-utils/jffs2reader.c
@@ -694,6 +694,11 @@ static struct jffs2_raw_dirent *resolvepath0(char *o, size_t size, uint32_t ino,
 
 	pp = path = xstrdup(p);
 
+	if(path == NULL){
+		*inos = 0;
+		return NULL;
+	}
+
 	if (*path == '/') {
 		path++;
 		ino = 1;
-- 
2.30.2