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authorNamjae Jeon <namjae.jeon@samsung.com>2014-07-12 16:11:42 -0400
committerTheodore Ts'o <tytso@mit.edu>2014-07-12 16:11:42 -0400
commitbf40c92635d63fcc574c52649f7cda13e0418ac1 (patch)
tree35f64bb357bc2db7ba35add326deb0d41084e092
parent3f1f9b851311a76226140b55b1ea22111234a7c2 (diff)
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>
-rw-r--r--fs/ext4/ialloc.c2
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,