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thinkpad-acpi: restrict procfs count value to sane upper limit
authorMichael Buesch <mb@bu3sch.de>
Sat, 1 Aug 2009 15:04:19 +0000 (12:04 -0300)
committerLen Brown <len.brown@intel.com>
Sun, 2 Aug 2009 03:50:40 +0000 (23:50 -0400)
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>
drivers/platform/x86/thinkpad_acpi.c patch | blob | blame | history

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 27d68e719e90df73305f9bc43c477507b353ba27..18f9ee63c50a76f986560f8f1b9184923071720f 100644 (file)
--- 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)