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| author | Jan Kara <jack@suse.cz> | 2010-10-20 18:49:20 +0200 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2011-01-06 17:03:55 +0100 |
| commit | 949f4a7c08bc4a050eae7aeeac3e6d019d1feafb (patch) | |
| tree | c017198a51ce2404c119fbe5bd8f497154efb0bc | |
| parent | udf: Move handling of uniqueID into a helper function and protect it by a s_a... (diff) | |
| download | linux-949f4a7c08bc4a050eae7aeeac3e6d019d1feafb.tar.xz linux-949f4a7c08bc4a050eae7aeeac3e6d019d1feafb.zip | |
udf: Protect all modifications of LVID with s_alloc_mutex
udf_open_lvid() and udf_close_lvid() were modifying LVID without
s_alloc_mutex. Since they can be called from remount, the modification
could race with other filesystem modifications of LVID so protect them
by s_alloc_mutex just to be sure.
Signed-off-by: Jan Kara <jack@suse.cz>
| -rw-r--r-- | fs/udf/super.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/udf/super.c b/fs/udf/super.c index 948e1aca0f34..e54960c0e960 100644 --- a/fs/udf/super.c +++ b/fs/udf/super.c @@ -1773,6 +1773,8 @@ static void udf_open_lvid(struct super_block *sb) if (!bh) return; + + mutex_lock(&sbi->s_alloc_mutex); lvid = (struct logicalVolIntegrityDesc *)bh->b_data; lvidiu = udf_sb_lvidiu(sbi); @@ -1789,6 +1791,7 @@ static void udf_open_lvid(struct super_block *sb) lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag); mark_buffer_dirty(bh); sbi->s_lvid_dirty = 0; + mutex_unlock(&sbi->s_alloc_mutex); } static void udf_close_lvid(struct super_block *sb) @@ -1801,6 +1804,7 @@ static void udf_close_lvid(struct super_block *sb) if (!bh) return; + mutex_lock(&sbi->s_alloc_mutex); lvid = (struct logicalVolIntegrityDesc *)bh->b_data; lvidiu = udf_sb_lvidiu(sbi); lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; @@ -1821,6 +1825,7 @@ static void udf_close_lvid(struct super_block *sb) lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag); mark_buffer_dirty(bh); sbi->s_lvid_dirty = 0; + mutex_unlock(&sbi->s_alloc_mutex); } u64 lvid_get_unique_id(struct super_block *sb) |