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authorWilco Dijkstra <wdijkstr@arm.com>2019-05-10 16:38:21 +0100
committerWilco Dijkstra <wdijkstr@arm.com>2019-05-10 16:38:21 +0100
commit5ad533e8e65092be962e414e0417112c65d154fb (patch)
treebb926e04c328e70f54fc026cbee805c52d9b2f6d /localedata
parent4aee85f96b881c1cb80a1fff752b8e2130a9a4d9 (diff)
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Fix tcache count maximum (BZ #24531)
The tcache counts[] array is a char, which has a very small range and thus
may overflow.  When setting tcache_count tunable, there is no overflow check.
However the tunable must not be larger than the maximum value of the tcache
counts[] array, otherwise it can overflow when filling the tcache.

	[BZ #24531]
	* malloc/malloc.c (MAX_TCACHE_COUNT): New define.
	(do_set_tcache_count): Only update if count is small enough.
	* manual/tunables.texi (glibc.malloc.tcache_count): Document max value.
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