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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
+16 −12
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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Revert unneeded changes
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@matthiasgoergens
matthiasgoergens committed Oct 9, 2022
commit ba806114d9810571f9aad81d2e3094e9f445e9c6
5 changes: 3 additions & 2 deletions Modules/audioop.c
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Original file line number Diff line number Diff line change
Expand Up @@ -172,7 +172,8 @@ 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 * (1 << 4)) | ((pcm_val >> (seg + 1)) & 0xF);
assert(seg >= 0);
uval = (unsigned char) (seg << 4) | ((pcm_val >> (seg + 1)) & 0xF);
return (uval ^ mask);
}

Expand Down Expand Up @@ -261,7 +262,7 @@ 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 * (1 << SEG_SHIFT);
aval = (unsigned char) seg << SEG_SHIFT;
if (seg < 2)
aval |= (pcm_val >> 1) & QUANT_MASK;
else
Expand Down