path: root/fs/ext3/super.c
diff options
authorMingming Cao <cmm@us.ibm.com>2006-06-25 05:47:50 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-25 10:01:07 -0700
commitfcd5df35882b128ef3e160fab3074e6fe7ae501b (patch)
tree2ffa30054f510e0fdca988d18ab28d6df12c3f06 /fs/ext3/super.c
parent[PATCH] schedule_on_each_cpu(): reduce kmalloc() size (diff)
[PATCH] Avoid disk sector_t overflow for >2TB ext3 filesystem
If ext3 filesystem is larger than 2TB, and sector_t is a u32 (i.e. CONFIG_LBD not defined in the kernel), the calculation of the disk sector will overflow. Add check at ext3_fill_super() and ext3_group_extend() to prevent mount/remount/resize >2TB ext3 filesystem if sector_t size is 4 bytes. Verified this patch on a 32 bit platform without CONFIG_LBD defined (sector_t is 32 bits long), mount refuse to mount a 10TB ext3. Signed-off-by: Mingming Cao<cmm@us.ibm.com> Acked-by: Andreas Dilger <adilger@clusterfs.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to '')
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/ext3/super.c b/fs/ext3/super.c
index a60cc6ec130f..df98a7709252 100644
--- a/fs/ext3/super.c
+++ b/fs/ext3/super.c
@@ -1565,6 +1565,16 @@ static int ext3_fill_super (struct super_block *sb, void *data, int silent)
goto failed_mount;
+ if (le32_to_cpu(es->s_blocks_count) >
+ (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
+ printk(KERN_ERR "EXT3-fs: filesystem on %s:"
+ " too large to mount safely\n", sb->s_id);
+ if (sizeof(sector_t) < 8)
+ printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not "
+ "enabled\n");
+ goto failed_mount;
+ }
if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
goto cantfind_ext3;
sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -