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| author | Fabian Frederick <fabf@skynet.be> | 2014-08-08 14:20:31 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-08-08 15:57:20 -0700 |
| commit | 8e19189ef8d1fce44f3acdf0fe9846cff9b37c78 (patch) | |
| tree | 0c4af0f63e37fa6353cf71002a4e500d5c5a0365 /fs/befs | |
| parent | 6d6747f85314687f72012ae85cde401db531e130 (diff) | |
| download | linux-8e19189ef8d1fce44f3acdf0fe9846cff9b37c78.tar.gz linux-8e19189ef8d1fce44f3acdf0fe9846cff9b37c78.tar.bz2 linux-8e19189ef8d1fce44f3acdf0fe9846cff9b37c78.zip | |
fs/befs/linuxvfs.c: check superblock before dump operation
befs_dump_super_block was called between befs_load_sb and befs_check_sb.
It has been reported to crash (5/900) with null block testing.
This patch loads, checks and only dump superblock if it's a valid one
then brelse bh.
(befs_dump_super_block uses disk_sb (bh->b_data) so it seems we need to
call it before brelse(bh) but I don't know why befs_check_sb was called
after brelse. Another thing I don't understand is why this problem
appears now).
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/befs')
| -rw-r--r-- | fs/befs/linuxvfs.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/fs/befs/linuxvfs.c b/fs/befs/linuxvfs.c index 0d6c07cc1149..4cf61ec6b7a8 100644 --- a/fs/befs/linuxvfs.c +++ b/fs/befs/linuxvfs.c @@ -832,16 +832,14 @@ befs_fill_super(struct super_block *sb, void *data, int silent) (befs_super_block *) ((void *) bh->b_data + x86_sb_off); } - if (befs_load_sb(sb, disk_sb) != BEFS_OK) + if ((befs_load_sb(sb, disk_sb) != BEFS_OK) || + (befs_check_sb(sb) != BEFS_OK)) goto unacquire_bh; befs_dump_super_block(sb, disk_sb); brelse(bh); - if (befs_check_sb(sb) != BEFS_OK) - goto unacquire_priv_sbp; - if( befs_sb->num_blocks > ~((sector_t)0) ) { befs_error(sb, "blocks count: %llu " "is larger than the host can use", |