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HID: picolcd_core: validate output report details

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commit 1e87a2456b upstream.

A HID device could send a malicious output report that would cause the
picolcd HID driver to trigger a NULL dereference during attr file writing.

[jkosina@suse.cz: changed

	report->maxfield < 1

to

	report->maxfield != 1

as suggested by Bruno].

CVE-2013-2899

Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Bruno Prémont <bonbons@linux-vserver.org>
Acked-by: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kees Cook 2013-08-28 22:31:52 +02:00 committed by Greg Kroah-Hartman
parent 56085cec9e
commit 0697d80576
1 changed files with 1 additions and 1 deletions
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2
drivers/hid/hid-picolcd_core.c
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@ -290,7 +290,7 @@ static ssize_t picolcd_operation_mode_store(struct device *dev,
buf += 10;
cnt -= 10;
}
if (!report)
if (!report || report->maxfield != 1)
return -EINVAL;
while (cnt > 0 && (buf[cnt-1] == '\n' || buf[cnt-1] == '\r'))