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| author | Rich Felker <dalias@aerifal.cx> | 2011-09-04 00:06:01 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2011-09-04 00:06:01 -0400 |
| commit | 32d67e938e8da0f37c59247acee8b10eaf9a113c (patch) | |
| tree | e87b7b5da7700f8af18ce90ceef850398ba9947c /src/stdio/open_wmemstream.c | |
| parent | d4fa6f0e08ff5a292d2aeeeeda80670a1a082cae (diff) | |
| download | musl-32d67e938e8da0f37c59247acee8b10eaf9a113c.tar.gz musl-32d67e938e8da0f37c59247acee8b10eaf9a113c.tar.xz musl-32d67e938e8da0f37c59247acee8b10eaf9a113c.zip | |
fix twos complement overflow bug in mem streams boundary check
the expression -off is not safe in case off is the most-negative value. instead apply - to base which is known to be non-negative and bounded within sanity.
Diffstat (limited to 'src/stdio/open_wmemstream.c')
| -rw-r--r-- | src/stdio/open_wmemstream.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/stdio/open_wmemstream.c b/src/stdio/open_wmemstream.c index 3bc0f254..41b92d21 100644 --- a/src/stdio/open_wmemstream.c +++ b/src/stdio/open_wmemstream.c @@ -29,7 +29,7 @@ static off_t wms_seek(FILE *f, off_t off, int whence) errno = EINVAL; return -1; } - if (-off > base || off > SSIZE_MAX/4-base) goto fail; + if (off < -base || off > SSIZE_MAX/4-base) goto fail; memset(&c->mbs, 0, sizeof c->mbs); return c->pos = base+off; } |