From: Cong Wang <xiyou.wangcong@xxxxxxxxx>
cxt->dir_path could be NULL, for example, when sysfs_init() fails,
check this before calling readlink()/readlink_at().
Cc: Karel Zak <kzak@xxxxxxxxxx>
Signed-off-by: Cong Wang <xiyou.wangcong@xxxxxxxxx>
---
diff --git a/lib/sysfs.c b/lib/sysfs.c
index 312191f..b4fb7cd 100644
--- a/lib/sysfs.c
+++ b/lib/sysfs.c
@@ -220,6 +220,9 @@ static int sysfs_open(struct sysfs_cxt *cxt, const char *attr)
ssize_t sysfs_readlink(struct sysfs_cxt *cxt, const char *attr,
char *buf, size_t bufsiz)
{
+ if (!cxt->dir_path)
+ return -1;
+
if (attr)
return readlink_at(cxt->dir_fd, cxt->dir_path, attr, buf, bufsiz);
--
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