On 2020/8/24 16:29, David Laight wrote:
From: Yang Shen
Sent: 24 August 2020 04:12
Replace 'sprintf' with 'scnprintf' to avoid overrun.
Signed-off-by: Yang Shen <shenyang39@xxxxxxxxxx>
Reviewed-by: Zhou Wang <wangzhou1@xxxxxxxxxxxxx>
---
drivers/crypto/hisilicon/zip/zip_main.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/drivers/crypto/hisilicon/zip/zip_main.c b/drivers/crypto/hisilicon/zip/zip_main.c
index df1a16f..1883d1b 100644
--- a/drivers/crypto/hisilicon/zip/zip_main.c
+++ b/drivers/crypto/hisilicon/zip/zip_main.c
@@ -428,7 +428,7 @@ static ssize_t hisi_zip_ctrl_debug_read(struct file *filp, char __user *buf,
return -EINVAL;
}
spin_unlock_irq(&file->lock);
- ret = sprintf(tbuf, "%u\n", val);
+ ret = scnprintf(tbuf, HZIP_BUF_SIZE, "%u\n", val);
Should that be sizeof (tbuf).
return simple_read_from_buffer(buf, count, pos, tbuf, ret);
}
@@ -514,13 +514,16 @@ static int hisi_zip_core_debug_init(struct hisi_qm *qm)
struct debugfs_regset32 *regset;
struct dentry *tmp_d;
char buf[HZIP_BUF_SIZE];
- int i;
+ int i, ret;
for (i = 0; i < HZIP_CORE_NUM; i++) {
if (i < HZIP_COMP_CORE_NUM)
- sprintf(buf, "comp_core%d", i);
+ ret = scnprintf(buf, HZIP_BUF_SIZE, "comp_core%d", i);
else
- sprintf(buf, "decomp_core%d", i - HZIP_COMP_CORE_NUM);
+ ret = scnprintf(buf, HZIP_BUF_SIZE, "decomp_core%d",
+ i - HZIP_COMP_CORE_NUM);
+ if (!ret)
+ return -ENOMEM;
and that is just so wrong - did you even try to test
the 'buffer too small' code path?
David
Do you means the check is unnecessary?
Yang
-
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.
