fat: fix possible overflow for fat_clusters

Intermediate value of fat_clusters can be overflowed on 32bits arch.

Reported-by: Krzysztof Strasburger <strasbur@chkw386.ch.pwr.wroc.pl>
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index dfce656ddb333a6e7720c8ab0e32984ad82f11f3..5d4513cb1b3c03604792f145125b21fb338a3101 100644 (file)
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -1229,6 +1229,19 @@ static int fat_read_root(struct inode *inode)
        return 0;
 }
 
+static unsigned long calc_fat_clusters(struct super_block *sb)
+{
+       struct msdos_sb_info *sbi = MSDOS_SB(sb);
+
+       /* Divide first to avoid overflow */
+       if (sbi->fat_bits != 12) {
+               unsigned long ent_per_sec = sb->s_blocksize * 8 / sbi->fat_bits;
+               return ent_per_sec * sbi->fat_length;
+       }
+
+       return sbi->fat_length * sb->s_blocksize * 8 / sbi->fat_bits;
+}
+
 /*
  * Read the super block of an MS-DOS FS.
  */
@@ -1434,7 +1447,7 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
                sbi->dirty = b->fat16.state & FAT_STATE_DIRTY;
 
        /* check that FAT table does not overflow */
-       fat_clusters = sbi->fat_length * sb->s_blocksize * 8 / sbi->fat_bits;
+       fat_clusters = calc_fat_clusters(sb);
        total_clusters = min(total_clusters, fat_clusters - FAT_START_ENT);
        if (total_clusters > MAX_FAT(sb)) {
                if (!silent)