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authorLinus Torvalds <torvalds@linux-foundation.org>2019-07-19 12:23:37 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-07-19 12:23:37 -0700
commitdd4542d2823ac55cb86450960423f55e818aa182 (patch)
tree6f8a8a2b939fd1ce6088a707948125ba63bb2151 /kernel
parent40ef768ab6eecc1b51461a034274350b31fc29d1 (diff)
parentcf144f81a99d1a3928f90b0936accfd3f45c9a0a (diff)
Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
Pull crypto fixes from Herbert Xu: - Fix missed wake-up race in padata - Use crypto_memneq in ccp - Fix version check in ccp - Fix fuzz test failure in ccp - Fix potential double free in crypto4xx - Fix compile warning in stm32 * 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: padata: use smp_mb in padata_reorder to avoid orphaned padata jobs crypto: ccp - Fix SEV_VERSION_GREATER_OR_EQUAL crypto: ccp/gcm - use const time tag comparison. crypto: ccp - memset structure fields to zero before reuse crypto: crypto4xx - fix a potential double free in ppc4xx_trng_probe crypto: stm32/hash - Fix incorrect printk modifier for size_t
Diffstat (limited to 'kernel')
-rw-r--r--kernel/padata.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/padata.c b/kernel/padata.c
index 2d2fddbb7a4c..15a8ad63f4ff 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -267,7 +267,12 @@ static void padata_reorder(struct parallel_data *pd)
* The next object that needs serialization might have arrived to
* the reorder queues in the meantime, we will be called again
* from the timer function if no one else cares for it.
+ *
+ * Ensure reorder_objects is read after pd->lock is dropped so we see
+ * an increment from another task in padata_do_serial. Pairs with
+ * smp_mb__after_atomic in padata_do_serial.
*/
+ smp_mb();
if (atomic_read(&pd->reorder_objects)
&& !(pinst->flags & PADATA_RESET))
mod_timer(&pd->timer, jiffies + HZ);
@@ -387,6 +392,13 @@ void padata_do_serial(struct padata_priv *padata)
list_add_tail(&padata->list, &pqueue->reorder.list);
spin_unlock(&pqueue->reorder.lock);
+ /*
+ * Ensure the atomic_inc of reorder_objects above is ordered correctly
+ * with the trylock of pd->lock in padata_reorder. Pairs with smp_mb
+ * in padata_reorder.
+ */
+ smp_mb__after_atomic();
+
put_cpu();
/* If we're running on the wrong CPU, call padata_reorder() via a