From 5e2efcd633a4a1fb95a129a75508e7d769e767be Mon Sep 17 00:00:00 2001

From: Mark Adler <madler@alumni.caltech.edu>

Date: Sun, 9 Feb 2020 20:36:28 -0800

Subject: [PATCH] Fix bug in UZbunzip2() that incorrectly updated G.incnt.

The update assumed a full buffer, which is not always full. This

could result in a false overlapped element detection when a small

bzip2-compressed file was unzipped. This commit remedies that.

---

 extract.c | 2 +-

 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/extract.c b/extract.c

index d9866f9..0cb7bfc 100644

--- a/extract.c

+++ b/extract.c

@@ -3010,7 +3010,7 @@ __GDEF

 #endif

     G.inptr = (uch *)bstrm.next_in;

-    G.incnt = (G.inbuf + INBUFSIZ) - G.inptr;  /* reset for other routines */

+    G.incnt -= G.inptr - G.inbuf;       /* reset for other routines */

 uzbunzip_cleanup_exit:

     err = BZ2_bzDecompressEnd(&bstrm);