[LTP] [PATCH v2 11/15] ujson: reader: Reject files with zero size

[Andrea Cervesato]

From: Andrea Cervesato <andrea.cervesato@suse.com>

Empty files and pseudo-files like sysfs or procfs report a size of 0
with lseek(). An empty file is not valid JSON, and reading JSON from
pseudo-files is unsupported. Reject files with zero size in
ujson_reader_load().

Fixes: c50a0e0751c8 ("libs: Vendor ujson library")
Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 libs/ujson/ujson_reader.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libs/ujson/ujson_reader.c b/libs/ujson/ujson_reader.c
index 21425f848..9d17bbf4b 100644
--- a/libs/ujson/ujson_reader.c
+++ b/libs/ujson/ujson_reader.c
@@ -1028,6 +1028,11 @@ ujson_reader *ujson_reader_load(const char *path)
 		goto err0;
 	}
 
+	if (!len) {
+		fprintf(stderr, "File is empty\n");
+		goto err0;
+	}
+
 	if (lseek(fd, 0, SEEK_SET) == (off_t)-1) {
 		fprintf(stderr, "lseek() failed\n");
 		goto err0;

-- 
2.51.0