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3ec979658e
The (start, size) tuple represents a range [start, start + size - 1], which means "start" and "start + size - 1" should be compared to see whether the range overflows. For example, a range with (start, size): (0xffffffff fffffff0, 0x00000000 00000010) represents [0xffffffff fffffff0, 0xffffffff ffffffff] ... would be judged overflow in the original code, while actually it is not. This patch fixes this and makes sure it still works when size is zero. Signed-off-by: Wei Yang <richard.weiyang@gmail.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: yinghai@kernel.org Link: http://lkml.kernel.org/r/1471657213-31817-1-git-send-email-richard.weiyang@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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