From: Dan Carpenter dan.carpenter@oracle.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@vger.kernel.org Signed-off-by: Dan Carpenter dan.carpenter@oracle.com Acked-by: Stanislav Yakovlev stas.yakovlev@gmail.com Signed-off-by: Kalle Valo kvalo@codeaurora.org Link: https://lore.kernel.org/r/YHaoA1i+8uT4ir4h@mwanda Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.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 @@ -647,8 +647,10 @@ 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;