From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> stable inclusion from stable-v4.19.306 commit 1915874d67287ba1ab71825ae6a4efbb2a0e2b11 bugzilla: https://gitee.com/src-openeuler/kernel/issues/I99K14 CVE: CVE-2023-52612 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- [ Upstream commit 6a4d1b18ef00a7b182740b7b4d8a0fcd317368f8 ] If scomp_acomp_comp_decomp() fails to allocate memory for the destination then we never copy back the data we compressed. It is probably best to return an error code instead 0 in case of failure. I haven't found any user that is using acomp_request_set_params() without the `dst' buffer so there is probably no harm. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Stable-dep-of: 744e1885922a ("crypto: scomp - fix req->dst buffer overflow") Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Felix Fu <fuzhen5@huawei.com> --- crypto/scompress.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/crypto/scompress.c b/crypto/scompress.c index 968bbcf65c94..15641c96ff99 100644 --- a/crypto/scompress.c +++ b/crypto/scompress.c @@ -174,8 +174,10 @@ static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir) if (!ret) { if (!req->dst) { req->dst = sgl_alloc(req->dlen, GFP_ATOMIC, NULL); - if (!req->dst) + if (!req->dst) { + ret = -ENOMEM; goto out; + } } scatterwalk_map_and_copy(scratch_dst, req->dst, 0, req->dlen, 1); -- 2.34.1