From 3936c7aa74d89e7a91dfbb2c1b7bfcad58a0355d Mon Sep 17 00:00:00 2001

From: shixuantong <1726671442@qq.com>

Date: Wed, 6 Apr 2022 17:40:57 +0800

Subject: [PATCH 1/2] Ensure that sz is greater than 0.

---

 lib/block.c | 10 ++++++++++

 1 file changed, 10 insertions(+)

diff --git a/lib/block.c b/lib/block.c

index 092bc28..f12c4bc 100644

--- a/lib/block.c

+++ b/lib/block.c

@@ -118,6 +118,11 @@ th_read(TAR *t)

 	if (TH_ISLONGLINK(t))

 	{

 		sz = th_get_size(t);

+		if ((int)sz <= 0)

+		{

+			errno = EINVAL;

+			return -1;

+		}

 		blocks = (sz / T_BLOCKSIZE) + (sz % T_BLOCKSIZE ? 1 : 0);

 		if (blocks > ((size_t)-1 / T_BLOCKSIZE))

 		{

@@ -168,6 +173,11 @@ th_read(TAR *t)

 	if (TH_ISLONGNAME(t))

 	{

 		sz = th_get_size(t);

+		if ((int)sz <= 0)

+		{

+			errno = EINVAL;

+			return -1;

+		}

 		blocks = (sz / T_BLOCKSIZE) + (sz % T_BLOCKSIZE ? 1 : 0);

 		if (blocks > ((size_t)-1 / T_BLOCKSIZE))

 		{

-- 

2.37.1