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| author | Denys Vlasenko | 2018-02-04 00:15:29 +0100 |
|---|---|---|
| committer | Denys Vlasenko | 2018-02-04 00:15:29 +0100 |
| commit | 2598915d43d7403e72d312ac426e585499e94173 (patch) | |
| tree | cb1e0e0decc6872e42081274647c8ec8786f8155 | |
| parent | 0e60a36c929e57e47d5de8e1ac0e53d4ec185a70 (diff) | |
| download | busybox-2598915d43d7403e72d312ac426e585499e94173.zip busybox-2598915d43d7403e72d312ac426e585499e94173.tar.gz | |
gunzip: fix from gzip-1.3.12 for gzip file with all zero length codes
Corresponding changelog from gzip-1.3.12 reads:
"""
2006-12-20 Paul Eggert <eggert@cs.ucla.edu>
* inflate.c (huft_build): Fix regression that caused gzip to
refuse to uncompress null input (all zero length codes). Problem
reported by Yiorgos Adamopoulos. This regression was caused by
the security patch installed 2006-11-20, which in turn came from
Debian, which in turn apparently came from Thomas Biege of SuSe.
"""
function old new delta
huft_build 1176 1216 +40
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| -rw-r--r-- | archival/libarchive/decompress_gunzip.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/archival/libarchive/decompress_gunzip.c b/archival/libarchive/decompress_gunzip.c index edff7e0..9a58d10 100644 --- a/archival/libarchive/decompress_gunzip.c +++ b/archival/libarchive/decompress_gunzip.c @@ -280,8 +280,8 @@ static unsigned fill_bitbuffer(STATE_PARAM unsigned bitbuffer, unsigned *current /* Given a list of code lengths and a maximum table size, make a set of * tables to decode that set of codes. Return zero on success, one if * the given code set is incomplete (the tables are still built in this - * case), two if the input is invalid (all zero length codes or an - * oversubscribed set of lengths) - in this case stores NULL in *t. + * case), two if the input is invalid (an oversubscribed set of lengths) + * - in this case stores NULL in *t. * * b: code lengths in bits (all assumed <= BMAX) * n: number of codes (assumed <= N_MAX) @@ -330,8 +330,15 @@ static int huft_build(const unsigned *b, const unsigned n, p++; /* can't combine with above line (Solaris bug) */ } while (--i); if (c[0] == n) { /* null input - all zero length codes */ - *m = 0; - return 2; + q = xzalloc(3 * sizeof(*q)); + //q[0].v.t = NULL; + q[1].e = 99; /* invalid code marker */ + q[1].b = 1; + q[2].e = 99; /* invalid code marker */ + q[2].b = 1; + *t = q + 1; + *m = 1; + return 0; } /* Find minimum and maximum length, bound *m by those */ |