51 lines
1.4 KiB
Diff
51 lines
1.4 KiB
Diff
From fed42742e0b33b358610bf62c7474f55e6465205 Mon Sep 17 00:00:00 2001
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From: Chet Ramey <chet.ramey@case.edu>
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Date: Wed, 17 Nov 2021 16:44:19 -0500
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Subject: [PATCH] Bash-5.1 patch 9: fix bash malloc implementation of
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malloc_usable_size
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---
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lib/malloc/malloc.c | 13 ++++++-------
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patchlevel.h | 2 +-
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2 files changed, 7 insertions(+), 8 deletions(-)
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diff --git a/lib/malloc/malloc.c b/lib/malloc/malloc.c
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index 439f8ef1..92e6efa5 100644
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--- a/lib/malloc/malloc.c
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+++ b/lib/malloc/malloc.c
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@@ -1286,13 +1286,12 @@ malloc_usable_size (mem)
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p = (union mhead *) ap - 1;
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}
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- /* XXX - should we return 0 if ISFREE? */
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- maxbytes = binsize(p->mh_index);
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-
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- /* So the usable size is the maximum number of bytes in the bin less the
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- malloc overhead */
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- maxbytes -= MOVERHEAD + MSLOP;
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- return (maxbytes);
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+ /* return 0 if ISFREE */
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+ if (p->mh_alloc == ISFREE)
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+ return 0;
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+
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+ /* Since we use bounds checking, the usable size is the last requested size. */
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+ return (p->mh_nbytes);
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}
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#if !defined (NO_VALLOC)
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diff --git a/patchlevel.h b/patchlevel.h
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index 10fde2ee..17586ff7 100644
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--- a/patchlevel.h
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+++ b/patchlevel.h
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@@ -25,6 +25,6 @@
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regexp `^#define[ ]*PATCHLEVEL', since that's what support/mkversion.sh
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looks for to find the patch level (for the sccs version string). */
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-#define PATCHLEVEL 8
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+#define PATCHLEVEL 9
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#endif /* _PATCHLEVEL_H_ */
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--
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2.31.1
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