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authorAndrzej Zaborowski <andrew.zaborowski@intel.com>2015-12-12 00:03:51 -0500
committerHerbert Xu <herbert@gondor.apana.org.au>2015-12-22 20:43:24 +0800
commit5319216dcfee14886abb2b7090e8fcf2e2d8a611 (patch)
tree16befddf660d00d6aea8c5c9acc4061c61e982ce /crypto/rsa-pkcs1pad.c
parent16f080aaadcb912c9a47c8603a38ccad87da38ea (diff)
downloadlwn-5319216dcfee14886abb2b7090e8fcf2e2d8a611.tar.gz
lwn-5319216dcfee14886abb2b7090e8fcf2e2d8a611.zip
crypto: rsa-pkcs1pad - don't allocate buffer on stack
Avoid the s390 compile "warning: 'pkcs1pad_encrypt_sign_complete' uses dynamic stack allocation" reported by kbuild test robot. Don't use a flat zero-filled buffer, instead zero the contents of the SGL. Signed-off-by: Andrew Zaborowski <andrew.zaborowski@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/rsa-pkcs1pad.c')
-rw-r--r--crypto/rsa-pkcs1pad.c27
1 files changed, 19 insertions, 8 deletions
diff --git a/crypto/rsa-pkcs1pad.c b/crypto/rsa-pkcs1pad.c
index accc67d16686..50f5c97e1087 100644
--- a/crypto/rsa-pkcs1pad.c
+++ b/crypto/rsa-pkcs1pad.c
@@ -110,21 +110,32 @@ static int pkcs1pad_encrypt_sign_complete(struct akcipher_request *req, int err)
struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
- uint8_t zeros[ctx->key_size - req_ctx->child_req.dst_len];
+ size_t pad_len = ctx->key_size - req_ctx->child_req.dst_len;
+ size_t chunk_len, pad_left;
+ struct sg_mapping_iter miter;
if (!err) {
- if (req_ctx->child_req.dst_len < ctx->key_size) {
- memset(zeros, 0, sizeof(zeros));
- sg_copy_from_buffer(req->dst,
- sg_nents_for_len(req->dst,
- sizeof(zeros)),
- zeros, sizeof(zeros));
+ if (pad_len) {
+ sg_miter_start(&miter, req->dst,
+ sg_nents_for_len(req->dst, pad_len),
+ SG_MITER_ATOMIC | SG_MITER_TO_SG);
+
+ pad_left = pad_len;
+ while (pad_left) {
+ sg_miter_next(&miter);
+
+ chunk_len = min(miter.length, pad_left);
+ memset(miter.addr, 0, chunk_len);
+ pad_left -= chunk_len;
+ }
+
+ sg_miter_stop(&miter);
}
sg_pcopy_from_buffer(req->dst,
sg_nents_for_len(req->dst, ctx->key_size),
req_ctx->out_buf, req_ctx->child_req.dst_len,
- sizeof(zeros));
+ pad_len);
}
req->dst_len = ctx->key_size;