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(trans_stream_zlib.c) Try to prevent null pointer dereferences

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This commit is contained in:
twinaphex 2017-09-30 01:41:09 +02:00
parent dc2664a4ef
commit f5dedd673f
2 changed files with 26 additions and 18 deletions
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26
libretro-common/streams/trans_stream_zlib.c
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@ -29,15 +29,16 @@
struct zlib_trans_stream
{
z_stream z;
int ex; /* window_bits or level */
bool inited;
int ex; /* window_bits or level */
z_stream z;
};
static void *zlib_deflate_stream_new(void)
{
struct zlib_trans_stream *ret = (struct zlib_trans_stream*)calloc(1, sizeof(struct zlib_trans_stream));
if (ret)
if (!ret)
return NULL;
ret->ex = 9;
return (void *) ret;
}
@ -45,7 +46,8 @@ static void *zlib_deflate_stream_new(void)
static void *zlib_inflate_stream_new(void)
{
struct zlib_trans_stream *ret = (struct zlib_trans_stream*)calloc(1, sizeof(struct zlib_trans_stream));
if (ret)
if (!ret)
return NULL;
ret->ex = MAX_WBITS;
return (void *) ret;
}
@ -53,6 +55,8 @@ static void *zlib_inflate_stream_new(void)
static void zlib_deflate_stream_free(void *data)
{
struct zlib_trans_stream *z = (struct zlib_trans_stream *) data;
if (!z)
return;
if (z->inited)
deflateEnd(&z->z);
free(z);
@ -73,6 +77,7 @@ static bool zlib_deflate_define(void *data, const char *prop, uint32_t val)
struct zlib_trans_stream *z = (struct zlib_trans_stream *) data;
if (string_is_equal_fast(prop, "level", 5))
{
if (z)
z->ex = (int) val;
return true;
}
@ -84,6 +89,7 @@ static bool zlib_inflate_define(void *data, const char *prop, uint32_t val)
struct zlib_trans_stream *z = (struct zlib_trans_stream *) data;
if (string_is_equal_fast(prop, "window_bits", 11))
{
if (z)
z->ex = (int) val;
return true;
}
@ -139,9 +145,10 @@ static bool zlib_deflate_trans(
uint32_t *rd, uint32_t *wn,
enum trans_stream_error *error)
{
int zret;
bool ret;
uint32_t pre_avail_in, pre_avail_out;
int zret = 0;
bool ret = false;
uint32_t pre_avail_in = 0;
uint32_t pre_avail_out = 0;
struct zlib_trans_stream *zt = (struct zlib_trans_stream *) data;
z_stream *z = &zt->z;
@ -202,8 +209,9 @@ static bool zlib_inflate_trans(
enum trans_stream_error *error)
{
int zret;
bool ret;
uint32_t pre_avail_in, pre_avail_out;
bool ret = false;
uint32_t pre_avail_in = 0;
uint32_t pre_avail_out = 0;
struct zlib_trans_stream *zt = (struct zlib_trans_stream *) data;
z_stream *z = &zt->z;