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Commit bf40c926 authored by Namjae Jeon's avatar Namjae Jeon Committed by Theodore Ts'o
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ext4: fix potential null pointer dereference in ext4_free_inode 



Fix potential null pointer dereferencing problem caused by e43bb4e6
("ext4: decrement free clusters/inodes counters when block group declared bad")

Reported-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: default avatarNamjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: default avatarAshish Sangwan <a.sangwan@samsung.com>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
Reviewed-by: default avatarLukas Czerner <lczerner@redhat.com>
parent 3f1f9b85

fs/ext4/ialloc.c

+1 −1
Original line number Diff line number Diff line
@@ -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,