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ext4: fix potential null pointer dereference in ext4_free_inode

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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>
This commit is contained in:
Namjae Jeon 2014-07-12 16:11:42 -04:00 committed by Theodore Ts'o
parent 3f1f9b8513
commit bf40c92635
1 changed files with 1 additions and 1 deletions
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2
fs/ext4/ialloc.c
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@ -338,7 +338,7 @@ void ext4_free_inode(handle_t *handle, struct inode *inode)
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,