From e7723b7e88f40966365761f73d5cf3719d4bd9c9 Mon Sep 17 00:00:00 2001
From: Pierre Pronchery <khorben@defora.org>
Date: Wed, 28 Sep 2011 10:39:26 +0000
Subject: [PATCH] Stricter validation check when seeking within a buffer

---
 src/arch.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/arch.c b/src/arch.c
index c71852d..7e7a9e0 100644
--- a/src/arch.c
+++ b/src/arch.c
@@ -737,7 +737,7 @@ static off_t _arch_seek_buffer(Arch * arch, off_t offset, int whence)
 	}
 	else if(whence == SEEK_CUR)
 	{
-		if(arch->buffer_pos + offset < 0)
+		if(offset < 0 && -offset > arch->buffer_pos)
 			return -error_set_code(1, "%s", "Invalid seek");
 		if(offset > 0 && (size_t)offset + arch->buffer_pos
 				>= arch->buffer_cnt)