crypto: amcc - check return value of sg_nents_for_len

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

Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/amcc/crypto4xx_core.c b/drivers/crypto/amcc/crypto4xx_core.c
index 58a630e..62134c8 100644 (file)
--- 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;