Merge branch 'for-linus' of git://git.kernel.dk/linux-block

Says Jens:

 "Time to push off some of the pending items.  I really wanted to wait
  until we had the regression nailed, but alas it's not quite there yet.
  But I'm very confident that it's "just" a missing expire on exit, so
  fix from Tejun should be fairly trivial.  I'm headed out for a week on
  the slopes.

  - Killing the barrier part of mtip32xx.  It doesn't really support
    barriers, and it doesn't need them (writes are fully ordered).

  - A few fixes from Dan Carpenter, preventing overflows of integer
    multiplication.

  - A fixup for loop, fixing a previous commit that didn't quite solve
    the partial read problem from Dave Young.

  - A bio integer overflow fix from Kent Overstreet.

  - Improvement/fix of the door "keep locked" part of the cdrom shared
    code from Paolo Benzini.

  - A few cfq fixes from Shaohua Li.

  - A fix for bsg sysfs warning when removing a file it did not create
    from Stanislaw Gruszka.

  - Two fixes for floppy from Vivek, preventing a crash.

  - A few block core fixes from Tejun.  One killing the over-optimized
    ioc exit path, cleaning that up nicely.  Two others fixing an oops
    on elevator switch, due to calling into the scheduler merge check
    code without holding the queue lock."

* 'for-linus' of git://git.kernel.dk/linux-block:
  block: fix lockdep warning on io_context release put_io_context()
  relay: prevent integer overflow in relay_open()
  loop: zero fill bio instead of return -EIO for partial read
  bio: don't overflow in bio_get_nr_vecs()
  floppy: Fix a crash during rmmod
  floppy: Cleanup disk->queue before caling put_disk() if add_disk() was never called
  cdrom: move shared static to cdrom_device_info
  bsg: fix sysfs link remove warning
  block: don't call elevator callbacks for plug merges
  block: separate out blk_rq_merge_ok() and blk_try_merge() from elevator functions
  mtip32xx: removed the irrelevant argument of mtip_hw_submit_io() and the unused member of struct driver_data
  block: strip out locking optimization in put_io_context()
  cdrom: use copy_to_user() without the underscores
  block: fix ioc locking warning
  block: fix NULL icq_cache reference
  block,cfq: change code order

2 files changed, 9 insertions, 3 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index 1b2ef3c23ae4..b77fd559c78e 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -910,7 +910,7 @@ static int copy_io(unsigned long clone_flags, struct task_struct *tsk)
                         return -ENOMEM;
 
                 new_ioc->ioprio = ioc->ioprio;
-                put_io_context(new_ioc, NULL);
+                put_io_context(new_ioc);
         }
 #endif
         return 0;
diff --git a/kernel/relay.c b/kernel/relay.c
index 4335e1d7ee2d..ab56a1764d4d 100644
--- a/kernel/relay.c
+++ b/kernel/relay.c
@@ -164,10 +164,14 @@ depopulate:
  */
 static struct rchan_buf *relay_create_buf(struct rchan *chan)
 {
-        struct rchan_buf *buf = kzalloc(sizeof(struct rchan_buf), GFP_KERNEL);
-        if (!buf)
+        struct rchan_buf *buf;
+
+        if (chan->n_subbufs > UINT_MAX / sizeof(size_t *))
                 return NULL;
 
+        buf = kzalloc(sizeof(struct rchan_buf), GFP_KERNEL);
+        if (!buf)
+                return NULL;
         buf->padding = kmalloc(chan->n_subbufs * sizeof(size_t *), GFP_KERNEL);
         if (!buf->padding)
                 goto free_buf;
@@ -574,6 +578,8 @@ struct rchan *relay_open(const char *base_filename,
 
         if (!(subbuf_size && n_subbufs))
                 return NULL;
+        if (subbuf_size > UINT_MAX / n_subbufs)
+                return NULL;
 
         chan = kzalloc(sizeof(struct rchan), GFP_KERNEL);
         if (!chan)