Hello LABBE Corentin, The patch 6c2b74d4774f: "crypto: sahara - check return value of sg_nents_for_len" from Nov 4, 2015, leads to the following static checker warning: drivers/crypto/sahara.c:480 sahara_hw_descriptor_create() warn: unsigned 'dev->nb_in_sg' is never less than zero. drivers/crypto/sahara.c 479 dev->nb_in_sg = sg_nents_for_len(dev->in_sg, dev->total); 480 if (dev->nb_in_sg < 0) { ^^^^^^^^^^^^^^^^^ Unsigned is never less than zero. 481 dev_err(dev->device, "Invalid numbers of src SG.\n"); 482 return dev->nb_in_sg; 483 } There are several other similar bugs as well: drivers/crypto/sahara.c:485 sahara_hw_descriptor_create() warn: unsigned 'dev->nb_out_sg' is never less than zero. drivers/crypto/sahara.c:804 sahara_sha_hw_links_create() warn: unsigned 'dev->nb_in_sg' is never less than zero. drivers/crypto/picoxcell_crypto.c:298 spacc_sg_to_ddt() warn: unsigned 'nents' is never less than zero. drivers/crypto/picoxcell_crypto.c:338 spacc_aead_make_ddts() warn: unsigned 'src_nents' is never less than zero. drivers/crypto/picoxcell_crypto.c:348 spacc_aead_make_ddts() warn: unsigned 'dst_nents' is never less than zero. regards, dan carpenter -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html