[PATCH] erofs-utils: check the return value of ftell

[Huang Jianan]

Need to check if we got a normal length.

Signed-off-by: Huang Jianan <huangjianan at oppo.com>
---
 lib/blobchunk.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/blobchunk.c b/lib/blobchunk.c
index 4a440d6..483362b 100644
--- a/lib/blobchunk.c
+++ b/lib/blobchunk.c
@@ -221,6 +221,8 @@ int erofs_blob_remap(void)
 
 	fflush(blobfile);
 	length = ftell(blobfile);
+	if (length < 0)
+		return -errno;
 	if (multidev) {
 		struct erofs_deviceslot dis = {
 			.blocks = erofs_blknr(length),
-- 
2.25.1