From: Al Viro <viro@zeniv.linux.org.uk>
Date: Tue, 31 Mar 2015 15:43:52 +0000 (-0400)
Subject: ioctx_alloc(): remove pointless check
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=08397acdd0f02d566154c9ac7f625ae8e77133b3;p=openwrt%2Fstaging%2Fblogic.git

ioctx_alloc(): remove pointless check

Way, way back kiocb used to be picked from arrays, so ioctx_alloc()
checked for multiplication overflow when calculating the size of
such array.  By the time fs/aio.c went into the tree (in 2002) they
were already allocated one-by-one by kmem_cache_alloc(), so that
check had already become pointless.  Let's bury it...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/fs/aio.c b/fs/aio.c
index 3b8467aeb5ee..40fddf4217bd 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -688,8 +688,7 @@ static struct kioctx *ioctx_alloc(unsigned nr_events)
 	nr_events *= 2;
 
 	/* Prevent overflows */
-	if ((nr_events > (0x10000000U / sizeof(struct io_event))) ||
-	    (nr_events > (0x10000000U / sizeof(struct kiocb)))) {
+	if (nr_events > (0x10000000U / sizeof(struct io_event))) {
 		pr_debug("ENOMEM: nr_events too high\n");
 		return ERR_PTR(-EINVAL);
 	}