This is a note to let you know that I've just added the patch titled
crypto: scompress - don't sleep with preemption disabled
to the 4.13-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-scompress-don-t-sleep-with-preemption-disabled.patch
and it can be found in the queue-4.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3c08377262880afc1621ab9cb6dbe7df47a6033d Mon Sep 17 00:00:00 2001
From: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Date: Fri, 21 Jul 2017 16:42:36 +0100
Subject: crypto: scompress - don't sleep with preemption disabled
From: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
commit 3c08377262880afc1621ab9cb6dbe7df47a6033d upstream.
Due to the use of per-CPU buffers, scomp_acomp_comp_decomp() executes
with preemption disabled, and so whether the CRYPTO_TFM_REQ_MAY_SLEEP
flag is set is irrelevant, since we cannot sleep anyway. So disregard
the flag, and use GFP_ATOMIC unconditionally.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
crypto/scompress.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
--- a/crypto/scompress.c
+++ b/crypto/scompress.c
@@ -211,9 +211,7 @@ static int scomp_acomp_comp_decomp(struc
scratch_dst, &req->dlen, *ctx);
if (!ret) {
if (!req->dst) {
- req->dst = crypto_scomp_sg_alloc(req->dlen,
- req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
- GFP_KERNEL : GFP_ATOMIC);
+ req->dst = crypto_scomp_sg_alloc(req->dlen, GFP_ATOMIC);
if (!req->dst)
goto out;
}
Patches currently in stable-queue which might be from ard.biesheuvel@xxxxxxxxxx are
queue-4.13/crypto-scompress-don-t-sleep-with-preemption-disabled.patch