Since snprintf() returns the would-be-output size instead of the actual output size, the succeeding calls may go beyond the given buffer limit. Fix it by replacing with scnprintf(). Signed-off-by: Takashi Iwai <tiwai@xxxxxxx> --- drivers/crypto/bcm/util.c | 40 ++++++++++++++++++++-------------------- 1 file changed, 20 insertions(+), 20 deletions(-) diff --git a/drivers/crypto/bcm/util.c b/drivers/crypto/bcm/util.c index cd7504101acd..2b304fc78059 100644 --- a/drivers/crypto/bcm/util.c +++ b/drivers/crypto/bcm/util.c @@ -366,88 +366,88 @@ static ssize_t spu_debugfs_read(struct file *filp, char __user *ubuf, ipriv = filp->private_data; out_offset = 0; - out_offset += snprintf(buf + out_offset, out_count - out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "Number of SPUs.........%u\n", ipriv->spu.num_spu); - out_offset += snprintf(buf + out_offset, out_count - out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "Current sessions.......%u\n", atomic_read(&ipriv->session_count)); - out_offset += snprintf(buf + out_offset, out_count - out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "Session count..........%u\n", atomic_read(&ipriv->stream_count)); - out_offset += snprintf(buf + out_offset, out_count - out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "Cipher setkey..........%u\n", atomic_read(&ipriv->setkey_cnt[SPU_OP_CIPHER])); - out_offset += snprintf(buf + out_offset, out_count - out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "Cipher Ops.............%u\n", atomic_read(&ipriv->op_counts[SPU_OP_CIPHER])); for (alg = 0; alg < CIPHER_ALG_LAST; alg++) { for (mode = 0; mode < CIPHER_MODE_LAST; mode++) { op_cnt = atomic_read(&ipriv->cipher_cnt[alg][mode]); if (op_cnt) { - out_offset += snprintf(buf + out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, " %-13s%11u\n", spu_alg_name(alg, mode), op_cnt); } } } - out_offset += snprintf(buf + out_offset, out_count - out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "Hash Ops...............%u\n", atomic_read(&ipriv->op_counts[SPU_OP_HASH])); for (alg = 0; alg < HASH_ALG_LAST; alg++) { op_cnt = atomic_read(&ipriv->hash_cnt[alg]); if (op_cnt) { - out_offset += snprintf(buf + out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, " %-13s%11u\n", hash_alg_name[alg], op_cnt); } } - out_offset += snprintf(buf + out_offset, out_count - out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "HMAC setkey............%u\n", atomic_read(&ipriv->setkey_cnt[SPU_OP_HMAC])); - out_offset += snprintf(buf + out_offset, out_count - out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "HMAC Ops...............%u\n", atomic_read(&ipriv->op_counts[SPU_OP_HMAC])); for (alg = 0; alg < HASH_ALG_LAST; alg++) { op_cnt = atomic_read(&ipriv->hmac_cnt[alg]); if (op_cnt) { - out_offset += snprintf(buf + out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, " %-13s%11u\n", hash_alg_name[alg], op_cnt); } } - out_offset += snprintf(buf + out_offset, out_count - out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "AEAD setkey............%u\n", atomic_read(&ipriv->setkey_cnt[SPU_OP_AEAD])); - out_offset += snprintf(buf + out_offset, out_count - out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "AEAD Ops...............%u\n", atomic_read(&ipriv->op_counts[SPU_OP_AEAD])); for (alg = 0; alg < AEAD_TYPE_LAST; alg++) { op_cnt = atomic_read(&ipriv->aead_cnt[alg]); if (op_cnt) { - out_offset += snprintf(buf + out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, " %-13s%11u\n", aead_alg_name[alg], op_cnt); } } - out_offset += snprintf(buf + out_offset, out_count - out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "Bytes of req data......%llu\n", (u64)atomic64_read(&ipriv->bytes_out)); - out_offset += snprintf(buf + out_offset, out_count - out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "Bytes of resp data.....%llu\n", (u64)atomic64_read(&ipriv->bytes_in)); - out_offset += snprintf(buf + out_offset, out_count - out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "Mailbox full...........%u\n", atomic_read(&ipriv->mb_no_spc)); - out_offset += snprintf(buf + out_offset, out_count - out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "Mailbox send failures..%u\n", atomic_read(&ipriv->mb_send_fail)); - out_offset += snprintf(buf + out_offset, out_count - out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "Check ICV errors.......%u\n", atomic_read(&ipriv->bad_icv)); if (ipriv->spu.spu_type == SPU_TYPE_SPUM) @@ -455,7 +455,7 @@ static ssize_t spu_debugfs_read(struct file *filp, char __user *ubuf, spu_ofifo_ctrl = ioread32(ipriv->spu.reg_vbase[i] + SPU_OFIFO_CTRL); fifo_len = spu_ofifo_ctrl & SPU_FIFO_WATERMARK; - out_offset += snprintf(buf + out_offset, + out_offset += scnprintf(buf + out_offset, out_count - out_offset, "SPU %d output FIFO high water.....%u\n", i, fifo_len); -- 2.16.4