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Fix invalid write in proc_get_ps_info

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'str' in this context is a single-byte "buffer" in read-only memory.
This means that initializing 8723cs with  rtw_power_mgnt > 3 allows the
user to cause a kernel oops by reading /proc/net/rtl8723cs/[dev]/ps_info

Signed-off-by: Dalton Durst <dalton@ubports.com>
This commit is contained in:
Dalton Durst 2020-06-23 20:41:25 -05:00 committed by Icenowy Zheng
parent 238f62cf18
commit 2371a976e3
1 changed files with 35 additions and 6 deletions
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41
core/rtw_debug.c
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@ -3029,16 +3029,45 @@ int proc_get_ps_info(struct seq_file *m, void *v)
DBG_871X_SEL_NL(m, "------------------------------\n");
DBG_871X_SEL_NL(m, "*LPS:\n");
if (lps_mode == PS_MODE_ACTIVE) {
switch (lps_mode) {
case PS_MODE_ACTIVE:
str = "NO LPS";
} else if (lps_mode == PS_MODE_MIN) {
break;
case PS_MODE_MIN:
str = "MIN";
} else if (lps_mode == PS_MODE_MAX) {
break;
case PS_MODE_MAX:
str = "MAX";
} else if (lps_mode == PS_MODE_DTIM) {
break;
case PS_MODE_DTIM:
str = "DTIM";
} else {
sprintf(str, "%d", lps_mode);
break;
case PS_MODE_VOIP:
str = "VOIP";
break;
case PS_MODE_UAPSD_WMM:
str = "UAPSD_WMM";
break;
case PS_MODE_UAPSD:
str = "UAPSD";
break;
case PS_MODE_IBSS:
str = "IBSS";
break;
case PS_MODE_WWLAN:
str = "WWLAN";
break;
case PM_Radio_Off:
str = "Radio_Off";
break;
case PM_Card_Disable:
str = "Card_Disable";
break;
case PS_MODE_NUM:
str = "NUM";
break;
default:
str = "Unknown";
}
DBG_871X_SEL_NL(m, " LPS mode: %s\n", str);