linux-kernel - [PATCH] stm32: stm32-hash: Add kmalloc

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Message-Id: <20230224215019.3687-1-kunyu@nfschina.com>
Date:   Sat, 25 Feb 2023 05:50:19 +0800
From:   Li kunyu <kunyu@...china.com>
To:     herbert@...dor.apana.org.au, davem@...emloft.net,
        mcoquelin.stm32@...il.com
Cc:     linux-crypto@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Li kunyu <kunyu@...china.com>
Subject: [PATCH] stm32: stm32-hash: Add kmalloc_array allocation check

If rctx->hw_context allocation of the context pointer failed. Returning
-ENOMEM and assigning NULL to the out pointer should improve the
robustness of the function.

Signed-off-by: Li kunyu <kunyu@...china.com>
---
 drivers/crypto/stm32/stm32-hash.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/crypto/stm32/stm32-hash.c b/drivers/crypto/stm32/stm32-hash.c
index d33006d43f76..18e79f62be96 100644
--- a/drivers/crypto/stm32/stm32-hash.c
+++ b/drivers/crypto/stm32/stm32-hash.c
@@ -970,6 +970,10 @@ static int stm32_hash_export(struct ahash_request *req, void *out)
 	rctx->hw_context = kmalloc_array(3 + HASH_CSR_REGISTER_NUMBER,
 					 sizeof(u32),
 					 GFP_KERNEL);
+	if (rctx->hw_context == NULL) {
+		out = NULL;
+		return -ENOMEM;
+	}
 
 	preg = rctx->hw_context;
 
-- 
2.18.2