diff options
Diffstat (limited to 'Modules/binascii.c')
| -rw-r--r-- | Modules/binascii.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/Modules/binascii.c b/Modules/binascii.c index 643450c..9ef3054 100644 --- a/Modules/binascii.c +++ b/Modules/binascii.c @@ -137,7 +137,7 @@ static char table_a2b_base64[] = { #define BASE64_PAD '=' /* Max binary chunk size; limited only by available memory */ -#define BASE64_MAXBIN (INT_MAX/2 - sizeof(PyStringObject)) +#define BASE64_MAXBIN (INT_MAX/2 - sizeof(PyStringObject) - 3) static unsigned char table_b2a_base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; @@ -436,8 +436,10 @@ binascii_b2a_base64(PyObject *self, PyObject *args) return NULL; } - /* We're lazy and allocate to much (fixed up later) */ - if ( (rv=PyString_FromStringAndSize(NULL, bin_len*2)) == NULL ) + /* We're lazy and allocate too much (fixed up later). + "+3" leaves room for up to two pad characters and a trailing + newline. Note that 'b' gets encoded as 'Yg==\n' (1 in, 5 out). */ + if ( (rv=PyString_FromStringAndSize(NULL, bin_len*2 + 3)) == NULL ) return NULL; ascii_data = (unsigned char *)PyString_AsString(rv); |