lib: fix the use of LZO to decompress initramfs images

This patch fixes 2 issues with the LZO decompressor:

- It doesn't handle the case where a block isn't compressed at all.  In
  this case, calling lzo1x_decompress_safe will fail, so we need to just
  use memcpy() instead (the upstream LZO code does something similar)

- Since commit 54291362d2a5738e1b0495df2abcb9e6b0563a3f ("initramfs: add
  missing decompressor error check") , the decompressor return code is
  checked in the init/initramfs.c The LZO decompressor didn't return the
  expected value, causing the initramfs code to falsely believe a
  decompression error occured

Signed-off-by: Albin Tonnerre <albin.tonnerre@free-electrons.com>
Tested-by: bert schulze <spambemyguest@googlemail.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 15 insertions, 7 deletions

diff --git a/lib/decompress_unlzo.c b/lib/decompress_unlzo.c
index db521f45626e..bcb3a4bd68ff 100644
--- a/lib/decompress_unlzo.c
+++ b/lib/decompress_unlzo.c
@@ -97,7 +97,7 @@ STATIC inline int INIT unlzo(u8 *input, int in_len,
         u32 src_len, dst_len;
         size_t tmp;
         u8 *in_buf, *in_buf_save, *out_buf;
-        int obytes_processed = 0;
+        int ret = -1;
 
         set_error_fn(error_fn);
 
@@ -174,15 +174,22 @@ STATIC inline int INIT unlzo(u8 *input, int in_len,
 
                 /* decompress */
                 tmp = dst_len;
-                r = lzo1x_decompress_safe((u8 *) in_buf, src_len,
+
+                /* When the input data is not compressed at all,
+                 * lzo1x_decompress_safe will fail, so call memcpy()
+                 * instead */
+                if (unlikely(dst_len == src_len))
+                        memcpy(out_buf, in_buf, src_len);
+                else {
+                        r = lzo1x_decompress_safe((u8 *) in_buf, src_len,
                                                 out_buf, &tmp);
 
-                if (r != LZO_E_OK || dst_len != tmp) {
-                        error("Compressed data violation");
-                        goto exit_2;
+                        if (r != LZO_E_OK || dst_len != tmp) {
+                                error("Compressed data violation");
+                                goto exit_2;
+                        }
                 }
 
-                obytes_processed += dst_len;
                 if (flush)
                         flush(out_buf, dst_len);
                 if (output)
@@ -196,6 +203,7 @@ STATIC inline int INIT unlzo(u8 *input, int in_len,
                         in_buf += src_len;
         }
 
+        ret = 0;
 exit_2:
         if (!input)
                 free(in_buf);
@@ -203,7 +211,7 @@ exit_1:
         if (!output)
                 free(out_buf);
 exit:
-        return obytes_processed;
+        return ret;
 }
 
 #define decompress unlzo