Module: xenomai-3
Branch: stable-3.0.x
Commit: 027898e4732cb5de9b2f1e762a61661ba9421d00
URL:
http://git.xenomai.org/?p=xenomai-3.git;a=commit;h=027898e4732cb5de9b2f1e762a61661ba9421d00
Author: Philippe Gerum <r...@xenomai.org>
Date: Sun Mar 5 15:43:32 2017 +0100
copperplate/heapobj-shared: fix bitmap corruption during allocation
---
lib/copperplate/heapobj-pshared.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/lib/copperplate/heapobj-pshared.c
b/lib/copperplate/heapobj-pshared.c
index 8da4a1f..578f442 100644
--- a/lib/copperplate/heapobj-pshared.c
+++ b/lib/copperplate/heapobj-pshared.c
@@ -308,6 +308,16 @@ static int reserve_page_range(uint32_t *bitmap, int
bitwords, int nrpages)
b += r;
v >>= r;
v |= -1U << (32 - r);
+ /*
+ * No more zero bits on the left, and not at
+ * the leftmost position: any ongoing zero bit
+ * sequence stops here in the current word,
+ * short of free bits. Reset the sequence, and
+ * keep searching for one which is at least
+ * nrpages-bit long.
+ */
+ if (v == -1U && b < 32)
+ seq = 0;
}
}
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