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Revision 1357272fc7deeebb7b3c5d1a071562edc273cdaf authored by Ilya Dryomov on 02 October 2013, 17:41:01 UTC, committed by Josef Bacik on 04 October 2013, 20:02:14 UTC 
Btrfs: fix a use-after-free bug in btrfs_dev_replace_finishing
 
free_device rcu callback, scheduled from btrfs_rm_dev_replace_srcdev,
can be processed before btrfs_scratch_superblock is called, which would
result in a use-after-free on btrfs_device contents.  Fix this by
zeroing the superblock before the rcu callback is registered.

Cc: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
1 parent 964fb15
Raw File
lzodefs.h 
/*
 *  lzodefs.h -- architecture, OS and compiler specific defines
 *
 *  Copyright (C) 1996-2012 Markus F.X.J. Oberhumer <markus@oberhumer.com>
 *
 *  The full LZO package can be found at:
 *  http://www.oberhumer.com/opensource/lzo/
 *
 *  Changed for Linux kernel use by:
 *  Nitin Gupta <nitingupta910@gmail.com>
 *  Richard Purdie <rpurdie@openedhand.com>
 */


#define COPY4(dst, src)	\
		put_unaligned(get_unaligned((const u32 *)(src)), (u32 *)(dst))
#if defined(__x86_64__)
#define COPY8(dst, src)	\
		put_unaligned(get_unaligned((const u64 *)(src)), (u64 *)(dst))
#else
#define COPY8(dst, src)	\
		COPY4(dst, src); COPY4((dst) + 4, (src) + 4)
#endif

#if defined(__BIG_ENDIAN) && defined(__LITTLE_ENDIAN)
#error "conflicting endian definitions"
#elif defined(__x86_64__)
#define LZO_USE_CTZ64	1
#define LZO_USE_CTZ32	1
#elif defined(__i386__) || defined(__powerpc__)
#define LZO_USE_CTZ32	1
#elif defined(__arm__) && (__LINUX_ARM_ARCH__ >= 5)
#define LZO_USE_CTZ32	1
#endif

#define M1_MAX_OFFSET	0x0400
#define M2_MAX_OFFSET	0x0800
#define M3_MAX_OFFSET	0x4000
#define M4_MAX_OFFSET	0xbfff

#define M1_MIN_LEN	2
#define M1_MAX_LEN	2
#define M2_MIN_LEN	3
#define M2_MAX_LEN	8
#define M3_MIN_LEN	3
#define M3_MAX_LEN	33
#define M4_MIN_LEN	3
#define M4_MAX_LEN	9

#define M1_MARKER	0
#define M2_MARKER	64
#define M3_MARKER	32
#define M4_MARKER	16

#define lzo_dict_t      unsigned short
#define D_BITS		13
#define D_SIZE		(1u << D_BITS)
#define D_MASK		(D_SIZE - 1)
#define D_HIGH		((D_MASK >> 1) + 1)
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