crypto: scomp - fix req->dst buffer overflow

stable inclusion
from stable-v4.19.306
commit 1142d65c5b881590962ad763f94505b6dd67d2fe
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I970CO
CVE: NA

Reference: https://github.com/gregkh/linux/commit/1142d65c5b881590962ad763f94505b6dd67d2fe



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[ Upstream commit 744e1885922a9943458954cfea917b31064b4131 ]

The req->dst buffer size should be checked before copying from the
scomp_scratch->dst to avoid req->dst buffer overflow problem.

Fixes: 1ab53a77 ("crypto: acomp - add driver-side scomp interface")
Reported-by:  <syzbot+3eff5e51bf1db122a16e@syzkaller.appspotmail.com>
Closes: https://lore.kernel.org/all/0000000000000b05cd060d6b5511@google.com/


Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
Reviewed-by: Barry Song <v-songbaohua@oppo.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Conflicts:
	crypto/scompress.c
Signed-off-by: GUO Zihua <guozihua@huawei.com>