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-rw-r--r--fs/hpfs/map.c3
-rw-r--r--fs/hpfs/super.c8
2 files changed, 9 insertions, 2 deletions
diff --git a/fs/hpfs/map.c b/fs/hpfs/map.c
index a790821366a..ea3d1ca43e1 100644
--- a/fs/hpfs/map.c
+++ b/fs/hpfs/map.c
@@ -17,7 +17,8 @@ unsigned int *hpfs_map_bitmap(struct super_block *s, unsigned bmp_block,
struct quad_buffer_head *qbh, char *id)
{
secno sec;
- if (hpfs_sb(s)->sb_chk) if (bmp_block * 16384 > hpfs_sb(s)->sb_fs_size) {
+ unsigned n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
+ if (hpfs_sb(s)->sb_chk) if (bmp_block >= n_bands) {
hpfs_error(s, "hpfs_map_bitmap called with bad parameter: %08x at %s", bmp_block, id);
return NULL;
}
diff --git a/fs/hpfs/super.c b/fs/hpfs/super.c
index 98580a3b500..f760c15f0bf 100644
--- a/fs/hpfs/super.c
+++ b/fs/hpfs/super.c
@@ -553,7 +553,13 @@ static int hpfs_fill_super(struct super_block *s, void *options, int silent)
sbi->sb_cp_table = NULL;
sbi->sb_c_bitmap = -1;
sbi->sb_max_fwd_alloc = 0xffffff;
-
+
+ if (sbi->sb_fs_size >= 0x80000000) {
+ hpfs_error(s, "invalid size in superblock: %08x",
+ (unsigned)sbi->sb_fs_size);
+ goto bail4;
+ }
+
/* Load bitmap directory */
if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
goto bail4;