Merge commit '67dd8f35c2d8ed80f26c9654b474cffc11c6674d' into patchwork

* .: (268 commits)
  Linux 3.16-rc6
  um: segv: Save regs only in case of a kernel mode fault
  um: Fix hung task in fix_range_common()
  um: Ensure that a stub page cannot get unmapped
  Revert "um: Fix wait_stub_done() error handling"
  btrfs: test for valid bdev before kobj removal in btrfs_rm_device
  Btrfs: fix abnormal long waiting in fsync
  random: check for increase of entropy_count because of signed conversion
  ARM: EXYNOS: Fix core ID used by platsmp and hotplug code
  ahci: add support for the Promise FastTrak TX8660 SATA HBA (ahci mode)
  ARM: at91/dt: add missing clocks property to pwm node in sam9x5.dtsi
  ARM: at91/dt: fix usb0 clocks definition in sam9n12 dtsi
  ARM: at91: at91sam9x5: correct typo error for ohci clock
  irqchip: gic: Fix core ID calculation when topology is read from DT
  GFS2: fs/gfs2/rgrp.c: kernel-doc warning fixes
  GFS2: memcontrol: Spelling s/invlidate/invalidate/
  GFS2: Allow caching of glocks for flock
  GFS2: Allow flocks to use normal glock dq rather than dq_wait
  GFS2: replace count*size kzalloc by kcalloc
  GFS2: Use GFP_NOFS when allocating glocks
  ...

Conflicts:
	drivers/media/dvb-frontends/si2168.c
	drivers/media/dvb-frontends/si2168_priv.h
	drivers/media/tuners/si2157.c

1 files changed, 14 insertions, 3 deletions

diff --git a/drivers/char/random.c b/drivers/char/random.c
index 0a7ac0a7b252..71529e196b84 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -641,7 +641,7 @@ retry:
 		} while (unlikely(entropy_count < pool_size-2 && pnfrac));
 	}
 
-	if (entropy_count < 0) {
+	if (unlikely(entropy_count < 0)) {
 		pr_warn("random: negative entropy/overflow: pool %s count %d\n",
 			r->name, entropy_count);
 		WARN_ON(1);
@@ -981,7 +981,7 @@ static size_t account(struct entropy_store *r, size_t nbytes, int min,
 		      int reserved)
 {
 	int entropy_count, orig;
-	size_t ibytes;
+	size_t ibytes, nfrac;
 
 	BUG_ON(r->entropy_count > r->poolinfo->poolfracbits);
 
@@ -999,7 +999,17 @@ retry:
 	}
 	if (ibytes < min)
 		ibytes = 0;
-	if ((entropy_count -= ibytes << (ENTROPY_SHIFT + 3)) < 0)
+
+	if (unlikely(entropy_count < 0)) {
+		pr_warn("random: negative entropy count: pool %s count %d\n",
+			r->name, entropy_count);
+		WARN_ON(1);
+		entropy_count = 0;
+	}
+	nfrac = ibytes << (ENTROPY_SHIFT + 3);
+	if ((size_t) entropy_count > nfrac)
+		entropy_count -= nfrac;
+	else
 		entropy_count = 0;
 
 	if (cmpxchg(&r->entropy_count, orig, entropy_count) != orig)
@@ -1376,6 +1386,7 @@ urandom_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
 			    "with %d bits of entropy available\n",
 			    current->comm, nonblocking_pool.entropy_total);
 
+	nbytes = min_t(size_t, nbytes, INT_MAX >> (ENTROPY_SHIFT + 3));
 	ret = extract_entropy_user(&nonblocking_pool, buf, nbytes);
 
 	trace_urandom_read(8 * nbytes, ENTROPY_BITS(&nonblocking_pool),