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| author |   Theodore Ts'o <tytso@mit.edu> | 2013-06-06 11:16:43 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2013-06-06 11:16:43 -0400 |
| commit | 2f2e09eb15849562aede80ed007658e4504ded26 (patch) | |
| tree | f8ee7779589ae6b59524b58f053b32bc3cdda211 /fs/ext4 | |
| parent | ext4: verify group number in verify_group_input() before using it (diff) | |
| download | linux-dev-2f2e09eb15849562aede80ed007658e4504ded26.tar.xz linux-dev-2f2e09eb15849562aede80ed007658e4504ded26.zip | |
ext4: add sanity check to ext4_get_group_info()
The group number passed to ext4_get_group_info() should be valid, but
let's add an assert to check this before we start creating a pointer
based on that group number and dereferencing it.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/ext4.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index bd9890f6d9ce..f85f1fb49df8 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -2313,6 +2313,7 @@ struct ext4_group_info *ext4_get_group_info(struct super_block *sb, { struct ext4_group_info ***grp_info; long indexv, indexh; + BUG_ON(group >= EXT4_SB(sb)->s_groups_count); grp_info = EXT4_SB(sb)->s_group_info; indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb)); indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1); |