This is a note to let you know that I've just added the patch titled
crypto: algif_skcipher - only call put_page on referenced and used pages
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
crypto-algif_skcipher-only-call-put_page-on-referenced-and-used-pages.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 445a582738de6802669aeed9c33ca406c23c3b1f Mon Sep 17 00:00:00 2001
From: Stephan Mueller <smueller@xxxxxxxxxx>
Date: Wed, 16 Aug 2017 11:56:24 +0200
Subject: crypto: algif_skcipher - only call put_page on referenced and used pages
From: Stephan Mueller <smueller@xxxxxxxxxx>
commit 445a582738de6802669aeed9c33ca406c23c3b1f upstream.
For asynchronous operation, SGs are allocated without a page mapped to
them or with a page that is not used (ref-counted). If the SGL is freed,
the code must only call put_page for an SG if there was a page assigned
and ref-counted in the first place.
This fixes a kernel crash when using io_submit with more than one iocb
using the sendmsg and sendpage (vmsplice/splice) interface.
Signed-off-by: Stephan Mueller <smueller@xxxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
crypto/algif_skcipher.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
--- a/crypto/algif_skcipher.c
+++ b/crypto/algif_skcipher.c
@@ -86,8 +86,13 @@ static void skcipher_free_async_sgls(str
}
sgl = sreq->tsg;
n = sg_nents(sgl);
- for_each_sg(sgl, sg, n, i)
- put_page(sg_page(sg));
+ for_each_sg(sgl, sg, n, i) {
+ struct page *page = sg_page(sg);
+
+ /* some SGs may not have a page mapped */
+ if (page && page_ref_count(page))
+ put_page(page);
+ }
kfree(sreq->tsg);
}
Patches currently in stable-queue which might be from smueller@xxxxxxxxxx are
queue-4.4/crypto-algif_skcipher-only-call-put_page-on-referenced-and-used-pages.patch