File lib-fs-resize-prevent-crash-resizing-FAT16.patch of Package parted.15765

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File lib-fs-resize-prevent-crash-resizing-FAT16.patch of Package parted.15765

From: Mike Fleetwood <mike.fleetwood@googlemail.com>
Date: Sun, 28 Sep 2014 16:15:48 +0100
Subject: lib-fs-resize: Prevent crash resizing FAT16 file systems
Patch-mainline: v3.3
Git-commit: 1e9e770f4bc7f3d80e09ecd1df58575fad064163

Resizing FAT16 file system crashes in libparted/fs/r/fat/resize.c
create_resize_context() because it was dereferencing NULL pointer
fs_info->info_sector to copy the info_sector.

Only FAT32 file systems have info_sector populated by fat_open() ->
fat_info_sector_read().  FAT12 and FAT16 file systems don't have an
info_sector so pointer fs_info->info_sector remains assigned NULL from
fat_alloc().  When resizing a FAT file system create_resize_context()
was always dereferencing fs_info->info_sector to memory copy the
info_sector, hence it crashed for FAT12 and FAT16.

Make create_resize_context() only copy the info_sector for FAT32 file
systems.

Reported by Christian Hesse in
https://bugzilla.gnome.org/show_bug.cgi?id=735669
---
 NEWS                        |    4 ++++
 libparted/fs/r/fat/resize.c |   12 +++++++++---
 2 files changed, 13 insertions(+), 3 deletions(-)

Index: parted-3.2/NEWS
===================================================================
--- parted-3.2.orig/NEWS
+++ parted-3.2/NEWS
@@ -160,6 +160,10 @@ GNU parted NEWS
   System partitions) or "msftres" (which sets the "Microsoft Reserved" type
   code).
 
+** Bug Fixes
+
+  libparted-fs-resize: Prevent crash resizing FAT16 file systems.
+
 
 * Noteworthy changes in release 3.1 (2012-03-02) [stable]
 
Index: parted-3.2/libparted/fs/r/fat/resize.c
===================================================================
--- parted-3.2.orig/libparted/fs/r/fat/resize.c
+++ parted-3.2/libparted/fs/r/fat/resize.c
@@ -668,11 +668,17 @@ create_resize_context (PedFileSystem* fs
 
 /* preserve boot code, etc. */
 	new_fs_info->boot_sector = ped_malloc (new_geom->dev->sector_size);
-	new_fs_info->info_sector = ped_malloc (new_geom->dev->sector_size);
 	memcpy (new_fs_info->boot_sector, fs_info->boot_sector,
 		new_geom->dev->sector_size);
-	memcpy (new_fs_info->info_sector, fs_info->info_sector,
-		new_geom->dev->sector_size);
+	new_fs_info->info_sector = NULL;
+	if (fs_info->fat_type == FAT_TYPE_FAT32)
+	{
+		PED_ASSERT (fs_info->info_sector != NULL);
+		new_fs_info->info_sector =
+			ped_malloc (new_geom->dev->sector_size);
+		memcpy (new_fs_info->info_sector, fs_info->info_sector,
+			new_geom->dev->sector_size);
+	}
 
 	new_fs_info->logical_sector_size = fs_info->logical_sector_size;
 	new_fs_info->sector_count = new_geom->length;

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File lib-fs-resize-prevent-crash-resizing-FAT16.patch of Package parted.15765

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