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[g]unzip: fix recent breakage.

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Also, do emit error message we so painstakingly pass from gzip internals

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2015-10-30 23:41:53 +01:00
parent 95650a86d1
commit 6bd3fff51a
2 changed files with 22 additions and 12 deletions
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33
archival/libarchive/decompress_gunzip.c
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@ -309,8 +309,7 @@ static int huft_build(const unsigned *b, const unsigned n,
huft_t *q; /* points to current table */
huft_t r; /* table entry for structure assignment */
huft_t *u[BMAX]; /* table stack */
unsigned v[N_MAX]; /* values in order of bit length */
unsigned v_end;
unsigned v[N_MAX + 1]; /* values in order of bit length. last v[] is never used */
int ws[BMAX + 1]; /* bits decoded stack */
int w; /* bits decoded */
unsigned x[BMAX + 1]; /* bit offsets, then code stack */
@ -365,15 +364,17 @@ static int huft_build(const unsigned *b, const unsigned n,
*xp++ = j;
}
/* Make a table of values in order of bit lengths */
/* Make a table of values in order of bit lengths.
* To detect bad input, unused v[i]'s are set to invalid value UINT_MAX.
* In particular, last v[i] is never filled and must not be accessed.
*/
memset(v, 0xff, sizeof(v));
p = b;
i = 0;
v_end = 0;
do {
j = *p++;
if (j != 0) {
v[x[j]++] = i;
v_end = x[j];
}
} while (++i < n);
@ -435,7 +436,9 @@ static int huft_build(const unsigned *b, const unsigned n,
/* set up table entry in r */
r.b = (unsigned char) (k - w);
if (p >= v + v_end) { // Was "if (p >= v + n)" but v[] can be shorter!
if (/*p >= v + n || -- redundant, caught by the second check: */
*p == UINT_MAX /* do we access uninited v[i]? (see memset(v))*/
) {
r.e = 99; /* out of values--invalid code */
} else if (*p < s) {
r.e = (unsigned char) (*p < 256 ? 16 : 15); /* 256 is EOB code */
@ -520,8 +523,9 @@ static NOINLINE int inflate_codes(STATE_PARAM_ONLY)
e = t->e;
if (e > 16)
do {
if (e == 99)
abort_unzip(PASS_STATE_ONLY);;
if (e == 99) {
abort_unzip(PASS_STATE_ONLY);
}
bb >>= t->b;
k -= t->b;
e -= 16;
@ -557,8 +561,9 @@ static NOINLINE int inflate_codes(STATE_PARAM_ONLY)
e = t->e;
if (e > 16)
do {
if (e == 99)
if (e == 99) {
abort_unzip(PASS_STATE_ONLY);
}
bb >>= t->b;
k -= t->b;
e -= 16;
@ -824,8 +829,9 @@ static int inflate_block(STATE_PARAM smallint *e)
b_dynamic >>= 4;
k_dynamic -= 4;
if (nl > 286 || nd > 30)
if (nl > 286 || nd > 30) {
abort_unzip(PASS_STATE_ONLY); /* bad lengths */
}
/* read in bit-length-code lengths */
for (j = 0; j < nb; j++) {
@ -906,12 +912,14 @@ static int inflate_block(STATE_PARAM smallint *e)
bl = lbits;
i = huft_build(ll, nl, 257, cplens, cplext, &inflate_codes_tl, &bl);
if (i != 0)
if (i != 0) {
abort_unzip(PASS_STATE_ONLY);
}
bd = dbits;
i = huft_build(ll + nl, nd, 0, cpdist, cpdext, &inflate_codes_td, &bd);
if (i != 0)
if (i != 0) {
abort_unzip(PASS_STATE_ONLY);
}
/* set up data for inflate_codes() */
inflate_codes_setup(PASS_STATE bl, bd);
@ -999,6 +1007,7 @@ inflate_unzip_internal(STATE_PARAM transformer_state_t *xstate)
error_msg = "corrupted data";
if (setjmp(error_jmp)) {
/* Error from deep inside zip machinery */
bb_error_msg(error_msg);
n = -1;
goto ret;
}

1
testsuite/unzip.tests
View File

@ -34,6 +34,7 @@ rm foo.zip
testing "unzip (bad archive)" "uudecode; unzip bad.zip 2>&1; echo \$?" \
"Archive: bad.zip
inflating: ]3j½r«IK-%Ix
unzip: corrupted data
unzip: inflate error
1
" \