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SLOB: fix bogus ksize calculation

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SLOB's ksize calculation was braindamaged and generally harmlessly
underreported the allocation size. But for very small buffers, it could
in fact overreport them, leading code depending on krealloc to overrun
the allocation and trample other data.

Signed-off-by: Matt Mackall <[email protected]>
Tested-by: Peter Zijlstra <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Matt Mackall 2008-10-07 11:37:35 -05:00 • committed by Linus Torvalds
commit 85ba94ba05
1 changed files with 1 additions and 1 deletions
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2
mm/slob.c
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@ -515,7 +515,7 @@ size_t ksize(const void *block)
sp = (struct slob_page *)virt_to_page(block);
if (slob_page(sp))
return ((slob_t *)block - 1)->units + SLOB_UNIT;
return (((slob_t *)block - 1)->units - 1) * SLOB_UNIT;
else
return sp->page.private;
}