[PATCH 7/7] crypto: amcc: check return value of sg_nents_for_len

[LABBE Corentin]

The sg_nents_for_len() function could fail, this patch add a check for
its return value.

Signed-off-by: LABBE Corentin <clabbe.montjoie@xxxxxxxxx>
---
 drivers/crypto/amcc/crypto4xx_core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/crypto/amcc/crypto4xx_core.c b/drivers/crypto/amcc/crypto4xx_core.c
index 27288fc..e6f7757 100644
--- a/drivers/crypto/amcc/crypto4xx_core.c
+++ b/drivers/crypto/amcc/crypto4xx_core.c
@@ -781,6 +781,10 @@ u32 crypto4xx_build_pd(struct crypto_async_request *req,
 
 	/* figure how many gd is needed */
 	num_gd = sg_nents_for_len(src, datalen);
+	if ((int)num_gd < 0) {
+		dev_err(dev->core_dev->device, "Invalid number of src SG.\n");
+		return -EINVAL;
+	}
 	if (num_gd == 1)
 		num_gd = 0;
 
-- 
2.4.10

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