From: Michael Buesch <mb@bu3sch.de>
Date: Sat, 1 Aug 2009 15:04:19 +0000 (-0300)
Subject: thinkpad-acpi: restrict procfs count value to sane upper limit
X-Git-Tag: v5.15~32937^2~4^2~1
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=5b05d4696d38c3172e79e855cc1e2ed044589508;p=mirror_ubuntu-kernels.git

thinkpad-acpi: restrict procfs count value to sane upper limit

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Acked-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>
---

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 27d68e719e90..18f9ee63c50a 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -766,6 +766,8 @@ static int dispatch_procfs_write(struct file *file,
 
 	if (!ibm || !ibm->write)
 		return -EINVAL;
+	if (count > PAGE_SIZE - 2)
+		return -EINVAL;
 
 	kernbuf = kmalloc(count + 2, GFP_KERNEL);
 	if (!kernbuf)