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USB: check usb_get_extra_descriptor for proper size

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When reading an extra descriptor, we need to properly check the minimum
and maximum size allowed, to prevent from invalid data being sent by a
device.

Reported-by: Hui Peng <benquike@gmail.com>
Reported-by: Mathias Payer <mathias.payer@nebelwelt.net>
Co-developed-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Hui Peng <benquike@gmail.com>
Signed-off-by: Mathias Payer <mathias.payer@nebelwelt.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathias Payer
2018-12-05 21:19:59 +01:00
committed by Greg Kroah-Hartman
parent 2f2dde6ba8
commit 704620afc7
4 changed files with 7 additions and 7 deletions
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4
include/linux/usb.h
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@@ -407,11 +407,11 @@ struct usb_host_bos {
};
int __usb_get_extra_descriptor(char *buffer, unsigned size,
unsigned char type, void **ptr);
unsigned char type, void **ptr, size_t min);
#define usb_get_extra_descriptor(ifpoint, type, ptr) \
__usb_get_extra_descriptor((ifpoint)->extra, \
(ifpoint)->extralen, \
type, (void **)ptr)
type, (void **)ptr, sizeof(**(ptr)))
/* ----------------------------------------------------------------------- */