A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-31 04:01:48 -04:00
Code Issues Projects Releases Packages Wiki Activity

ACPI: Fix bound checks for copy_from_user in the acpi /proc code

Browse source 
The ACPI /proc write() code takes an unsigned length argument like any write()
function, but then assigned it to a *signed* integer called "len".
Only after this is a sanity check for len done to make it not larger than 4.

Due to the type change a len < 0 is in principle also possible; this patch
adds a check for this.

Signed-off-by: Arjan van de Ven <[email protected]>
Signed-off-by: Len Brown <[email protected]>
This commit is contained in:
Arjan van de Ven 2009-09-26 20:50:25 +02:00 • committed by Len Brown
commit d9f6501806
1 changed files with 2 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

2
drivers/acpi/proc.c
View file

@ -398,6 +398,8 @@ acpi_system_write_wakeup_device(struct file *file,
if (len > 4)
len = 4;
if (len < 0)
return -EFAULT;
if (copy_from_user(strbuf, buffer, len))
return -EFAULT;