[dunfell][PATCH] tar: Fix CVE-2021-20193

@@ -0,0 +1,133 @@
+From d9d4435692150fa8ff68e1b1a473d187cc3fd777 Mon Sep 17 00:00:00 2001
+From: Sergey Poznyakoff <gray@gnu.org>
+Date: Sun, 17 Jan 2021 20:41:11 +0200
+Subject: Fix memory leak in read_header
+
+Bug reported in https://savannah.gnu.org/bugs/?59897
+
+* src/list.c (read_header): Don't return directly from the loop.
+Instead set the status and break.  Return the status.  Free
+next_long_name and next_long_link before returning.
+
+CVE: CVE-2021-20193
+Upstream-Status: Backport
+[https://git.savannah.gnu.org/cgit/tar.git/patch/?id=d9d4435692150fa8ff68e1b1a473d187cc3fd777]
+Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
+
+---
+ src/list.c | 40 ++++++++++++++++++++++++++++------------
+ 1 file changed, 28 insertions(+), 12 deletions(-)
+
+diff --git a/src/list.c b/src/list.c
+index e40a5c8..d7ef441 100644
+--- a/src/list.c
++++ b/src/list.c
+@@ -408,26 +408,27 @@ read_header (union block **return_block, struct tar_stat_info *info,
+ 	     enum read_header_mode mode)
+ {
+   union block *header;
+-  union block *header_copy;
+   char *bp;
+   union block *data_block;
+   size_t size, written;
+-  union block *next_long_name = 0;
+-  union block *next_long_link = 0;
++  union block *next_long_name = NULL;
++  union block *next_long_link = NULL;
+   size_t next_long_name_blocks = 0;
+   size_t next_long_link_blocks = 0;
+-
++  enum read_header status = HEADER_SUCCESS;
++  
+   while (1)
+     {
+-      enum read_header status;
+-
+       header = find_next_block ();
+       *return_block = header;
+       if (!header)
+-	return HEADER_END_OF_FILE;
++	{
++	  status = HEADER_END_OF_FILE;
++	  break;
++	}
+ 
+       if ((status = tar_checksum (header, false)) != HEADER_SUCCESS)
+-	return status;
++	break;
+ 
+       /* Good block.  Decode file size and return.  */
+ 
+@@ -437,7 +438,10 @@ read_header (union block **return_block, struct tar_stat_info *info,
+ 	{
+ 	  info->stat.st_size = OFF_FROM_HEADER (header->header.size);
+ 	  if (info->stat.st_size < 0)
+-	    return HEADER_FAILURE;
++	    {
++	      status = HEADER_FAILURE;
++	      break;
++	    }
+ 	}
+ 
+       if (header->header.typeflag == GNUTYPE_LONGNAME
+@@ -447,10 +451,14 @@ read_header (union block **return_block, struct tar_stat_info *info,
+ 	  || header->header.typeflag == SOLARIS_XHDTYPE)
+ 	{
+ 	  if (mode == read_header_x_raw)
+-	    return HEADER_SUCCESS_EXTENDED;
++	    {
++	      status = HEADER_SUCCESS_EXTENDED;
++	      break;
++	    }
+ 	  else if (header->header.typeflag == GNUTYPE_LONGNAME
+ 		   || header->header.typeflag == GNUTYPE_LONGLINK)
+ 	    {
++	      union block *header_copy;
+ 	      size_t name_size = info->stat.st_size;
+ 	      size_t n = name_size % BLOCKSIZE;
+ 	      size = name_size + BLOCKSIZE;
+@@ -517,7 +525,10 @@ read_header (union block **return_block, struct tar_stat_info *info,
+ 	      xheader_decode_global (&xhdr);
+ 	      xheader_destroy (&xhdr);
+ 	      if (mode == read_header_x_global)
+-		return HEADER_SUCCESS_EXTENDED;
++		{
++		  status = HEADER_SUCCESS_EXTENDED;
++		  break;
++		}
+ 	    }
+ 
+ 	  /* Loop!  */
+@@ -536,6 +547,7 @@ read_header (union block **return_block, struct tar_stat_info *info,
+ 	      name = next_long_name->buffer + BLOCKSIZE;
+ 	      recent_long_name = next_long_name;
+ 	      recent_long_name_blocks = next_long_name_blocks;
++	      next_long_name = NULL;
+ 	    }
+ 	  else
+ 	    {
+@@ -567,6 +579,7 @@ read_header (union block **return_block, struct tar_stat_info *info,
+ 	      name = next_long_link->buffer + BLOCKSIZE;
+ 	      recent_long_link = next_long_link;
+ 	      recent_long_link_blocks = next_long_link_blocks;
++	      next_long_link = NULL;
+ 	    }
+ 	  else
+ 	    {
+@@ -578,9 +591,12 @@ read_header (union block **return_block, struct tar_stat_info *info,
+ 	    }
+ 	  assign_string (&info->link_name, name);
+ 
+-	  return HEADER_SUCCESS;
++	  break;
+ 	}
+     }
++  free (next_long_name);
++  free (next_long_link);
++  return status;
+ }
+ 
+ #define ISOCTAL(c) ((c)>='0'&&(c)<='7')
+-- 
+cgit v1.2.1
+

@@ -8,6 +8,7 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=d32239bcb673463ab874e80d47fae504"
 
 SRC_URI = "${GNU_MIRROR}/tar/tar-${PV}.tar.bz2 \
            file://musl_dirent.patch \
+           file://CVE-2021-20193.patch \
 "
 
 SRC_URI[md5sum] = "17917356fff5cb4bd3cd5a6c3e727b05"