linux-kernel - [PATCH 5.12 065/677] ipw2x00: potential buffer overflow in libipw_wx_set

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Date:   Wed, 12 May 2021 16:41:51 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Stanislav Yakovlev <stas.yakovlev@...il.com>,
        Kalle Valo <kvalo@...eaurora.org>
Subject: [PATCH 5.12 065/677] ipw2x00: potential buffer overflow in libipw_wx_set_encodeext()

From: Dan Carpenter <dan.carpenter@...cle.com>

commit 260a9ad9446723d4063ed802989758852809714d upstream.

The "ext->key_len" is a u16 that comes from the user.  If it's over
SCM_KEY_LEN (32) that could lead to memory corruption.

Fixes: e0d369d1d969 ("[PATCH] ieee82011: Added WE-18 support to default wireless extension handler")
Cc: stable@...r.kernel.org
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Acked-by: Stanislav Yakovlev <stas.yakovlev@...il.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Link: https://lore.kernel.org/r/YHaoA1i+8uT4ir4h@mwanda
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/wireless/intel/ipw2x00/libipw_wx.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/net/wireless/intel/ipw2x00/libipw_wx.c
+++ b/drivers/net/wireless/intel/ipw2x00/libipw_wx.c
@@ -633,8 +633,10 @@ int libipw_wx_set_encodeext(struct libip
 	}
 
 	if (ext->alg != IW_ENCODE_ALG_NONE) {
-		memcpy(sec.keys[idx], ext->key, ext->key_len);
-		sec.key_sizes[idx] = ext->key_len;
+		int key_len = clamp_val(ext->key_len, 0, SCM_KEY_LEN);
+
+		memcpy(sec.keys[idx], ext->key, key_len);
+		sec.key_sizes[idx] = key_len;
 		sec.flags |= (1 << idx);
 		if (ext->alg == IW_ENCODE_ALG_WEP) {
 			sec.encode_alg[idx] = SEC_ALG_WEP;