[PATCH 4/5] [v2] wifi: mwifiex: handle possible sscanf() errors

[Dmitry Antipov <dmantipov@xxxxxxxxx>]

Return -EINVAL on possible 'sscanf()' errors in
'mwifiex_regrdwr_write()' and 'mwifiex_rdeeprom_write()'.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Dmitry Antipov <dmantipov@xxxxxxxxx>
---
v2: adjust to match series
---
 drivers/net/wireless/marvell/mwifiex/debugfs.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/debugfs.c b/drivers/net/wireless/marvell/mwifiex/debugfs.c
index 0cdd6c50c1c0..f9c9fec7c792 100644
--- a/drivers/net/wireless/marvell/mwifiex/debugfs.c
+++ b/drivers/net/wireless/marvell/mwifiex/debugfs.c
@@ -425,7 +425,10 @@ mwifiex_regrdwr_write(struct file *file,
 	if (IS_ERR(buf))
 		return PTR_ERR(buf);
 
-	sscanf(buf, "%u %x %x", &reg_type, &reg_offset, &reg_value);
+	if (sscanf(buf, "%u %x %x", &reg_type, &reg_offset, &reg_value) != 3) {
+		ret = -EINVAL;
+		goto done;
+	}
 
 	if (reg_type == 0 || reg_offset == 0) {
 		ret = -EINVAL;
@@ -691,7 +694,10 @@ mwifiex_rdeeprom_write(struct file *file,
 	if (IS_ERR(buf))
 		return PTR_ERR(buf);
 
-	sscanf(buf, "%d %d", &offset, &bytes);
+	if (sscanf(buf, "%d %d", &offset, &bytes) != 2) {
+		ret = -EINVAL;
+		goto done;
+	}
 
 	if (offset == -1 || bytes == -1) {
 		ret = -EINVAL;
-- 
2.41.0