linux-kernel - [RFC][PATCH 1/2] zram: do not allocate buffer if crypto comp allocation failed

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Date: Wed,  7 Feb 2024 15:57:11 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Minchan Kim <minchan@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: [RFC][PATCH 1/2] zram: do not allocate buffer if crypto comp allocation failed

Do not allocate working buffer if we failed to lookup and
alloc crypto comp. User-space can request unsupported
compression algorithm.

Signed-off-by: Sergey Senozhatsky <senozhatsky@...omium.org>
---
 drivers/block/zram/zcomp.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/block/zram/zcomp.c b/drivers/block/zram/zcomp.c
index 8237b08c49d8..d88954e8c7bf 100644
--- a/drivers/block/zram/zcomp.c
+++ b/drivers/block/zram/zcomp.c
@@ -50,12 +50,15 @@ static void zcomp_strm_free(struct zcomp_strm *zstrm)
 static int zcomp_strm_init(struct zcomp_strm *zstrm, struct zcomp *comp)
 {
 	zstrm->tfm = crypto_alloc_comp(comp->name, 0, 0);
+	if (IS_ERR_OR_NULL(zstrm->tfm))
+		return -EINVAL;
+
 	/*
 	 * allocate 2 pages. 1 for compressed data, plus 1 extra for the
 	 * case when compressed size is larger than the original one
 	 */
 	zstrm->buffer = vzalloc(2 * PAGE_SIZE);
-	if (IS_ERR_OR_NULL(zstrm->tfm) || !zstrm->buffer) {
+	if (!zstrm->buffer) {
 		zcomp_strm_free(zstrm);
 		return -ENOMEM;
 	}
-- 
2.43.0.594.gd9cf4e227d-goog