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| author | Namjae Jeon <namjae.jeon@samsung.com> | 2014-07-12 22:11:42 +0200 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2014-07-12 22:11:42 +0200 |
| commit | bf40c92635d63fcc574c52649f7cda13e0418ac1 (patch) | |
| tree | 35f64bb357bc2db7ba35add326deb0d41084e092 /fs/ext4 | |
| parent | ext4: fix a potential deadlock in __ext4_es_shrink() (diff) | |
| download | linux-bf40c92635d63fcc574c52649f7cda13e0418ac1.tar.xz linux-bf40c92635d63fcc574c52649f7cda13e0418ac1.zip | |
ext4: fix potential null pointer dereference in ext4_free_inode
Fix potential null pointer dereferencing problem caused by e43bb4e612
("ext4: decrement free clusters/inodes counters when block group declared bad")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Ashish Sangwan <a.sangwan@samsung.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Lukas Czerner <lczerner@redhat.com>
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/ialloc.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c index 0840bf321cdb..5b87fc36aab8 100644 --- a/fs/ext4/ialloc.c +++ b/fs/ext4/ialloc.c @@ -338,7 +338,7 @@ out: fatal = err; } else { ext4_error(sb, "bit already cleared for inode %lu", ino); - if (!EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) { + if (gdp && !EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) { int count; count = ext4_free_inodes_count(sb, gdp); percpu_counter_sub(&sbi->s_freeinodes_counter, |