[PATCH] fix %s in affs_fill_super()

%s is only valid if array is known to contain NUL or precision is given and
does not exceed the size of array.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 7 insertions, 5 deletions

diff --git a/fs/affs/super.c b/fs/affs/super.c
index 8765cba35bb9..5200f4938df0 100644
--- a/fs/affs/super.c
+++ b/fs/affs/super.c
@@ -271,6 +271,7 @@ static int affs_fill_super(struct super_block *sb, void *data, int silent)
         int                      reserved;
         unsigned long            mount_flags;
         int                      tmp_flags;     /* fix remount prototype... */
+        u8                       sig[4];
 
         pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
 
@@ -370,8 +371,9 @@ got_root:
                 printk(KERN_ERR "AFFS: Cannot read boot block\n");
                 goto out_error;
         }
-        chksum = be32_to_cpu(*(__be32 *)boot_bh->b_data);
+        memcpy(sig, boot_bh->b_data, 4);
         brelse(boot_bh);
+        chksum = be32_to_cpu(*(__be32 *)sig);
 
         /* Dircache filesystems are compatible with non-dircache ones
          * when reading. As long as they aren't supported, writing is
@@ -420,11 +422,11 @@ got_root:
         }
 
         if (mount_flags & SF_VERBOSE) {
-                chksum = cpu_to_be32(chksum);
-                printk(KERN_NOTICE "AFFS: Mounting volume \"%*s\": Type=%.3s\\%c, Blocksize=%d\n",
-                        AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0],
+                u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
+                printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
+                        len > 31 ? 31 : len,
                         AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
-                        (char *)&chksum,((char *)&chksum)[3] + '0',blocksize);
+                        sig, sig[3] + '0', blocksize);
         }
 
         sb->s_flags |= MS_NODEV | MS_NOSUID;