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mwifiex: Fix possible buffer overflows in mwifiex_cmd_append_vsie_tlv() 

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>
This commit is contained in:
Qing Xu 2020-01-02 10:39:27 +08:00 committed by Kalle Valo
parent 3a9b153c55
commit b70261a288
1 changed files with 7 additions and 0 deletions
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7
drivers/net/wireless/marvell/mwifiex/scan.c
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@ -2884,6 +2884,13 @@ mwifiex_cmd_append_vsie_tlv(struct mwifiex_private *priv,
vs_param_set->header.len = vs_param_set->header.len =
cpu_to_le16((((u16) priv->vs_ie[id].ie[1]) cpu_to_le16((((u16) priv->vs_ie[id].ie[1])
& 0x00FF) + 2); & 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, memcpy(vs_param_set->ie, priv->vs_ie[id].ie,
le16_to_cpu(vs_param_set->header.len)); le16_to_cpu(vs_param_set->header.len));
*buffer += le16_to_cpu(vs_param_set->header.len) + *buffer += le16_to_cpu(vs_param_set->header.len) +