tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel: avoid overflow in cmp_range

Avoid overflow possibility.

[ The overflow is purely theoretical, since this is used for memory
ranges that aren't even close to using the full 64 bits, but this is
the right thing to do regardless. - Linus ]

Signed-off-by: Louis Langholtz <lou_langholtz@me.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Peter Anvin <hpa@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

authored by

Louis Langholtz and committed by
Linus Torvalds fc7f0dd3 7ad4b4ae

+5 -5
+5 -5
kernel/range.c
··· 113 113 { 114 114 const struct range *r1 = x1; 115 115 const struct range *r2 = x2; 116 - s64 start1, start2; 117 116 118 - start1 = r1->start; 119 - start2 = r2->start; 120 - 121 - return start1 - start2; 117 + if (r1->start < r2->start) 118 + return -1; 119 + if (r1->start > r2->start) 120 + return 1; 121 + return 0; 122 122 } 123 123 124 124 int clean_sort_range(struct range *range, int az)