From: Qing Xu m1s5p6688@gmail.com
[ Upstream commit b70261a288ea4d2f4ac7cd04be08a9f0f2de4f4d ]
mwifiex_cmd_append_vsie_tlv() calls memcpy() without checking the destination size may trigger a buffer overflower, which a local user could use to cause denial of service or the execution of arbitrary code. Fix it by putting the length check before calling memcpy().
Signed-off-by: Qing Xu m1s5p6688@gmail.com Signed-off-by: Kalle Valo kvalo@codeaurora.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/wireless/mwifiex/scan.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/net/wireless/mwifiex/scan.c b/drivers/net/wireless/mwifiex/scan.c index 39b78dc1bd92b..e7c8972431d34 100644 --- a/drivers/net/wireless/mwifiex/scan.c +++ b/drivers/net/wireless/mwifiex/scan.c @@ -2568,6 +2568,13 @@ mwifiex_cmd_append_vsie_tlv(struct mwifiex_private *priv, vs_param_set->header.len = cpu_to_le16((((u16) priv->vs_ie[id].ie[1]) & 0x00FF) + 2); + if (le16_to_cpu(vs_param_set->header.len) > + MWIFIEX_MAX_VSIE_LEN) { + mwifiex_dbg(priv->adapter, ERROR, + "Invalid param length!\n"); + break; + } + memcpy(vs_param_set->ie, priv->vs_ie[id].ie, le16_to_cpu(vs_param_set->header.len)); *buffer += le16_to_cpu(vs_param_set->header.len) +