[PATCH] initramfs: fix "Decoding failed"

[Hongfei Shang]

From: Hongfei Shang <shanghong...@kylinos.cn>

when initrd image file load in memory, it is align to 4 bytes,
so there are may be some padding bytes(<4),
should ignore these padding bytes and handle as normal end

before: (when size of initrd.img is: size%4 = 1, 2 or 3)
"Initramfs unpacking failed: Decoding failed"

after:
no error message

Signed-off-by: Hongfei Shang <shanghong...@kylinos.cn>
---
 lib/decompress_unlz4.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/decompress_unlz4.c b/lib/decompress_unlz4.c
index c0cfcfd486be..7527f1541dfd 100644
--- a/lib/decompress_unlz4.c
+++ b/lib/decompress_unlz4.c
@@ -181,6 +181,14 @@ STATIC inline int INIT unlz4(u8 *input, long in_len,
                                goto exit_2;
                        }
                        inp += chunksize;
+
+                       if (size < 4) {
+                               unsigned int padding = 0;
+
+                               memcpy(&padding, inp, size);
+                               if (padding == 0)
+                                       break;
+                       }
                }
        }
 
-- 
2.25.1