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gh-96821: Fix undefined behaviour in `audioop.c` by matthiasgoergens · Pull Request #96923 · python/cpython · GitHub
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gh-96821: Fix undefined behaviour in audioop.c #96923

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Merged
mdickinson merged 11 commits into from
Oct 10, 2022
Merged

gh-96821: Fix undefined behaviour in audioop.c #96923

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13b5850
gh-96821: Fix undefined behaviour in `audioop.c`
matthiasgoergens Sep 19, 2022
07d709a
📜🤖 Added by blurb_it.
blurb-it[bot] Sep 19, 2022
fd6f822
Merge branch 'main' into matthias/fix-audioop-UB
matthiasgoergens Sep 20, 2022
a3502da
Merge branch 'main' into matthias/fix-audioop-UB
matthiasgoergens Sep 26, 2022
98b2352
Merge branch 'main' into matthias/fix-audioop-UB
matthiasgoergens Sep 27, 2022
c549094
Merge remote-tracking branch 'origin/main' into matthias/fix-audioop-UB
matthiasgoergens Oct 5, 2022
15e43a6
Move asserts for more coverage
matthiasgoergens Oct 5, 2022
4e36000
Merge branch 'main' into matthias/fix-audioop-UB
matthiasgoergens Oct 8, 2022
c3f9108
Merge branch 'main' into matthias/fix-audioop-UB
matthiasgoergens Oct 9, 2022
da7aab3
Merge remote-tracking branch 'origin/main' into matthias/fix-audioop-UB
matthiasgoergens Oct 9, 2022
ba80611
Revert unneeded changes
matthiasgoergens Oct 9, 2022
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Core and Builtins/2022-09-19-03-35-01.gh-issue-96821.izK6JA.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Fix undefined behaviour in ``audioop.c``.
30 changes: 16 additions & 14 deletions Modules/audioop.c
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,8 @@ static const int16_t seg_uend[8] = {
static int16_t
search(int16_t val, const int16_t *table, int size)
{
assert(0 <= size);
assert(size < INT16_MAX);
int i;

for (i = 0; i < size; i++) {
Expand Down Expand Up @@ -170,7 +172,7 @@ st_14linear2ulaw(int16_t pcm_val) /* 2's complement (14-bit range) */
if (seg >= 8) /* out of range, return maximum value. */
return (unsigned char) (0x7F ^ mask);
else {
uval = (unsigned char) (seg << 4) | ((pcm_val >> (seg + 1)) & 0xF);
uval = (unsigned char) (seg * (1 << 4)) | ((pcm_val >> (seg + 1)) & 0xF);
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return (uval ^ mask);
}

Expand Down Expand Up @@ -259,7 +261,7 @@ st_linear2alaw(int16_t pcm_val) /* 2's complement (13-bit range) */
if (seg >= 8) /* out of range, return maximum value. */
return (unsigned char) (0x7F ^ mask);
else {
aval = (unsigned char) seg << SEG_SHIFT;
aval = (unsigned char) seg * (1 << SEG_SHIFT);
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if (seg < 2)
aval |= (pcm_val >> 1) & QUANT_MASK;
else
Expand Down Expand Up @@ -300,13 +302,13 @@ static const int stepsizeTable[89] = {
#ifdef WORDS_BIGENDIAN
#define GETINT24(cp, i) ( \
((unsigned char *)(cp) + (i))[2] + \
(((unsigned char *)(cp) + (i))[1] << 8) + \
(((signed char *)(cp) + (i))[0] << 16) )
(((unsigned char *)(cp) + (i))[1] * (1 << 8)) + \
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(((signed char *)(cp) + (i))[0] * (1 << 16)) )
#else
#define GETINT24(cp, i) ( \
((unsigned char *)(cp) + (i))[0] + \
(((unsigned char *)(cp) + (i))[1] << 8) + \
(((signed char *)(cp) + (i))[2] << 16) )
(((unsigned char *)(cp) + (i))[1] * (1 << 8)) + \
(((signed char *)(cp) + (i))[2] * (1 << 16)) )
#endif


Expand Down Expand Up @@ -347,10 +349,10 @@ static const int stepsizeTable[89] = {
} while(0)


#define GETSAMPLE32(size, cp, i) ( \
(size == 1) ? (int)GETINT8((cp), (i)) << 24 : \
(size == 2) ? (int)GETINT16((cp), (i)) << 16 : \
(size == 3) ? (int)GETINT24((cp), (i)) << 8 : \
#define GETSAMPLE32(size, cp, i) ( \
(size == 1) ? (int)GETINT8((cp), (i)) * (1 << 24) : \
(size == 2) ? (int)GETINT16((cp), (i)) * (1 << 16) : \
(size == 3) ? (int)GETINT24((cp), (i)) * (1 << 8) : \
(int)GETINT32((cp), (i)))

#define SETSAMPLE32(size, cp, i, val) do { \
Expand Down Expand Up @@ -1558,7 +1560,7 @@ audioop_ulaw2lin_impl(PyObject *module, Py_buffer *fragment, int width)

cp = fragment->buf;
for (i = 0; i < fragment->len*width; i += width) {
int val = st_ulaw2linear16(*cp++) << 16;
int val = st_ulaw2linear16(*cp++) * (1 << 16);
SETSAMPLE32(width, ncp, i, val);
}
return rv;
Expand Down Expand Up @@ -1632,7 +1634,7 @@ audioop_alaw2lin_impl(PyObject *module, Py_buffer *fragment, int width)
cp = fragment->buf;

for (i = 0; i < fragment->len*width; i += width) {
val = st_alaw2linear16(*cp++) << 16;
val = st_alaw2linear16(*cp++) * (1 << 16);
SETSAMPLE32(width, ncp, i, val);
}
return rv;
Expand Down Expand Up @@ -1757,7 +1759,7 @@ audioop_lin2adpcm_impl(PyObject *module, Py_buffer *fragment, int width,

/* Step 6 - Output value */
if ( bufferstep ) {
outputbuffer = (delta << 4) & 0xf0;
outputbuffer = (delta * (1 << 4)) & 0xf0;
} else {
*ncp++ = (delta & 0x0f) | outputbuffer;
}
Expand Down Expand Up @@ -1875,7 +1877,7 @@ audioop_adpcm2lin_impl(PyObject *module, Py_buffer *fragment, int width,
step = stepsizeTable[index];

/* Step 6 - Output value */
SETSAMPLE32(width, ncp, i, valpred << 16);
SETSAMPLE32(width, ncp, i, valpred * (1 << 16));
}

rv = Py_BuildValue("(O(ii))", str, valpred, index);
Expand Down