[PATCH] crypto: AF_ALG - update correct dst SGL entry
STALE3301d
From: Stephan Müller <hidden>
Date: 2017-08-30 07:17:49
Subsystem:
crypto api, the rest · Maintainers:
Herbert Xu, "David S. Miller", Linus Torvalds
When two adjacent TX SGL are processed and parts of both TX SGLs are pulled into the per-request TX SGL, the wrong per-request TX SGL entries were updated. This fixes a NULL pointer dereference when a cipher implementation walks the TX SGL where some of the SGL entries were NULL. Signed-off-by: Stephan Mueller <redacted> --- crypto/af_alg.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index ffa9f4ccd9b4..337cf382718e 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c@@ -619,14 +619,14 @@ void af_alg_pull_tsgl(struct sock *sk, size_t used, struct scatterlist *dst, struct af_alg_ctx *ctx = ask->private; struct af_alg_tsgl *sgl; struct scatterlist *sg; - unsigned int i, j; + unsigned int i, j = 0; while (!list_empty(&ctx->tsgl_list)) { sgl = list_first_entry(&ctx->tsgl_list, struct af_alg_tsgl, list); sg = sgl->sg; - for (i = 0, j = 0; i < sgl->cur; i++) { + for (i = 0; i < sgl->cur; i++) { size_t plen = min_t(size_t, used, sg[i].length); struct page *page = sg_page(sg + i);
--
2.13.5