Arnd Bergmann e65d28d4e9 uaccess: fix integer overflow on access_ok() ... commit 222ca305c9 upstream. Three architectures check the end of a user access against the address limit without taking a possible overflow into account. Passing a negative length or another overflow in here returns success when it should not. Use the most common correct implementation here, which optimizes for a constant 'size' argument, and turns the common case into a single comparison. Cc: stable@vger.kernel.org Fixes: da55128194 ("csky: User access") Fixes: f663b60f52 ("microblaze: Fix uaccess_ok macro") Fixes: 7567746e1c ("Hexagon: Add user access functions") Reported-by: David Laight <David.Laight@aculab.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-03-28 09:58:45 +02:00
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include	uaccess: fix integer overflow on access_ok()	2022-03-28 09:58:45 +02:00
kernel	Merge branch 'akpm' (patches from Andrew)	2021-09-03 10:08:28 -07:00
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