[Xen-devel] [PATCH 8/9] Decompressors: check for write errors in unlzo.c

["Jan Beulich" <JBeulich@xxxxxxxx>]

From: Lasse Collin <lasse.collin@xxxxxxxxxxx>

The return value of flush() is not checked in unlzo().  This means that
the decompressor won't stop even if the caller doesn't want more data.
This can happen e.g.  with a corrupt LZO-compressed initramfs image.

Signed-off-by: Lasse Collin <lasse.collin@xxxxxxxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/common/unlzo.c
+++ b/xen/common/unlzo.c
@@ -202,8 +202,8 @@ STATIC int INIT unlzo(u8 *input, unsigne
                        }
                }
 
-               if (flush)
-                       flush(out_buf, dst_len);
+               if (flush && flush(out_buf, dst_len) != dst_len)
+                       goto exit_2;
                if (output)
                        out_buf += dst_len;
                if (posp)

Attachment: unlzo-check-write-errors.patch
Description: Text document

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