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| author | Szabolcs Nagy <nsz@port70.net> | 2023-01-20 11:37:39 +0100 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2023-02-12 17:46:50 -0500 |
| commit | 35fdfe62a4ff471074ca53b7626ec80e83d244bd (patch) | |
| tree | 3afc106241abc363b5a239a1c0a58ae82a02950e /src/math | |
| parent | 7e13e5ae69a243b90b90d2f4b79b2a150f806335 (diff) | |
| download | musl-35fdfe62a4ff471074ca53b7626ec80e83d244bd.tar.gz musl-35fdfe62a4ff471074ca53b7626ec80e83d244bd.tar.xz musl-35fdfe62a4ff471074ca53b7626ec80e83d244bd.zip | |
math: fix undefined shift in logf
A signed int shift overflowed when computing a constant mask, use hex literal instead. This is unlikely to cause actual issues unless the code was compiled with ubsan or similar instrumentation specifically to catch this. The stripped libc.so is unchanged on x86_64. Reported by q66 on irc.
Diffstat (limited to 'src/math')
| -rw-r--r-- | src/math/logf.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/math/logf.c b/src/math/logf.c index 7ee5d7fe..e4c2237c 100644 --- a/src/math/logf.c +++ b/src/math/logf.c @@ -53,7 +53,7 @@ float logf(float x) tmp = ix - OFF; i = (tmp >> (23 - LOGF_TABLE_BITS)) % N; k = (int32_t)tmp >> 23; /* arithmetic shift */ - iz = ix - (tmp & 0x1ff << 23); + iz = ix - (tmp & 0xff800000); invc = T[i].invc; logc = T[i].logc; z = (double_t)asfloat(iz); |