fs/minix: fix block limit check for V1 filesystems

The minix filesystem reads its maximum file size from its on-disk
superblock.  This value isn't necessarily a multiple of the block size.
When it's not, the V1 block mapping code doesn't allow mapping the last
possible block.  Commit 6ed6a722f9ab ("minixfs: fix block limit check")
fixed this in the V2 mapping code.  Fix it in the V1 mapping code too.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Qiujun Huang <anenbupt@gmail.com>
Link: http://lkml.kernel.org/r/20200628060846.682158-6-ebiggers@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/minix/itree_v1.c b/fs/minix/itree_v1.c
index c0d418209ead12a4acb25821e2ed2be796d350fe..405573a79aab46a4a139a23025e375a9552fdec3 100644 (file)
--- a/fs/minix/itree_v1.c
+++ b/fs/minix/itree_v1.c
@@ -29,7 +29,7 @@ static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
        if (block < 0) {
                printk("MINIX-fs: block_to_path: block %ld < 0 on dev %pg\n",
                        block, inode->i_sb->s_bdev);
-       } else if (block >= inode->i_sb->s_maxbytes/BLOCK_SIZE) {
+       } else if ((u64)block * BLOCK_SIZE >= inode->i_sb->s_maxbytes) {
                if (printk_ratelimit())
                        printk("MINIX-fs: block_to_path: "
                               "block %ld too big on dev %pg\n",