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unlzma: fix another SEGV case

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function                                             old     new   delta
unpack_lzma_stream                                  1705    1717     +12

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2018-04-19 19:29:49 +02:00
parent 2aeb201c97
commit e09c426456
3 changed files with 20 additions and 4 deletions
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9
archival/libarchive/decompress_unlzma.c
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@@ -224,6 +224,7 @@ unpack_lzma_stream(transformer_state_t *xstate)
rc_t *rc;
int i;
uint8_t *buffer;
uint32_t buffer_size;
uint8_t previous_byte = 0;
size_t buffer_pos = 0, global_pos = 0;
int len = 0;
@@ -253,7 +254,8 @@ unpack_lzma_stream(transformer_state_t *xstate)
if (header.dict_size == 0)
header.dict_size++;
buffer = xmalloc(MIN(header.dst_size, header.dict_size));
buffer_size = MIN(header.dst_size, header.dict_size);
buffer = xmalloc(buffer_size);
{
int num_probs;
@@ -464,7 +466,10 @@ unpack_lzma_stream(transformer_state_t *xstate)
if ((int32_t)pos < 0) {
pos += header.dict_size;
/* bug 10436 has an example file where this triggers: */
if ((int32_t)pos < 0)
//if ((int32_t)pos < 0)
// goto bad;
/* more stringent test (see unzip_bad_lzma_1.zip): */
if (pos >= buffer_size)
goto bad;
}
previous_byte = buffer[pos];