30 lines
1.0 KiB
Diff
30 lines
1.0 KiB
Diff
From e54e1299404101a5a9d0cf5e45512b543967f958 Mon Sep 17 00:00:00 2001
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From: Mark Adler <madler@alumni.caltech.edu>
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Date: Sat, 5 Sep 2015 17:45:55 -0700
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Subject: [PATCH] Avoid shifts of negative values inflateMark().
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The C standard says that bit shifts of negative integers is
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undefined. This casts to unsigned values to assure a known
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result.
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---
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inflate.c | 5 +++--
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1 file changed, 3 insertions(+), 2 deletions(-)
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diff --git a/inflate.c b/inflate.c
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index 2889e3a..a718416 100644
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--- a/inflate.c
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+++ b/inflate.c
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@@ -1506,9 +1506,10 @@ z_streamp strm;
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{
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struct inflate_state FAR *state;
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- if (strm == Z_NULL || strm->state == Z_NULL) return -1L << 16;
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+ if (strm == Z_NULL || strm->state == Z_NULL)
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+ return (long)(((unsigned long)0 - 1) << 16);
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state = (struct inflate_state FAR *)strm->state;
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- return ((long)(state->back) << 16) +
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+ return (long)(((unsigned long)((long)state->back)) << 16) +
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(state->mode == COPY ? state->length :
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(state->mode == MATCH ? state->was - state->length : 0));
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}
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