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libspl sys/sysmacros.h: Fix P2ROUNDUP_TYPED to not trigger integer overflow #3949

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libspl sys/sysmacros.h: Fix P2ROUNDUP_TYPED to not trigger integer overflow #3949

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6 changes: 2 additions & 4 deletions lib/libspl/include/sys/sysmacros.h
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Original file line number Diff line number Diff line change
Expand Up @@ -49,9 +49,7 @@
*/
#define P2ALIGN(x, align) ((x) & -(align))
#define P2CROSS(x, y, align) (((x) ^ (y)) > (align) - 1)
#define P2ROUNDUP(x, align) (-(-(x) & -(align)))
#define P2ROUNDUP_TYPED(x, align, type) \
(-(-(type)(x) & -(type)(align)))
#define P2ROUNDUP(x, align) ((((x) - 1) | ((align) - 1)) + 1)
#define P2BOUNDARY(off, len, align) \
(((off) ^ ((off) + (len) - 1)) > (align) - 1)
#define P2PHASE(x, align) ((x) & ((align) - 1))
Expand Down Expand Up @@ -79,7 +77,7 @@
#define P2NPHASE_TYPED(x, align, type) \
(-(type)(x) & ((type)(align) - 1))
#define P2ROUNDUP_TYPED(x, align, type) \
(-(-(type)(x) & -(type)(align)))
((((type)(x) - 1) | ((type)(align) - 1)) + 1)
#define P2END_TYPED(x, align, type) \
(-(~(type)(x) & -(type)(align)))
#define P2PHASEUP_TYPED(x, align, phase, type) \
Expand Down