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uncompress: Avoid reading an extra byte

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When reading the next code in a stream, avoid reading an extra byte if
we're going to throw it away. When there's no more bits to extract from
the stream, bits will be 0 and we'll mask the read byte with 0 anyway.
At worst, this will avoid reading one past the end of gbuf array (which
is not possible in well formed streams).

PR: 127912
Reviewed by:	emaste
Differential Revision:	https://reviews.freebsd.org/D47041
This commit is contained in:
David Jones 2024-10-11 09:49:17 -06:00 committed by Warner Losh
parent 6cde8f3ef7
commit 818c7b769a
1 changed files with 2 additions and 1 deletions
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3
usr.bin/compress/zopen.c
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@ -620,7 +620,8 @@ getcode(struct s_zstate *zs)
}
/* High order bits. */
gcode |= (*bp & rmask[bits]) << r_off;
if (bits > 0)
gcode |= (*bp & rmask[bits]) << r_off;
roffset += n_bits;
return (gcode);