musl - musl - an implementation of the standard library for Linux-based systems

musl - an implementation of the standard library for Linux-based systems

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author	Rich Felker <dalias@aerifal.cx>	2020年04月24日 10:35:01 -0400
committer	Rich Felker <dalias@aerifal.cx>	2020年04月24日 10:39:17 -0400
commit	f3ecdc1043f44468b2db794b259c5f66737f6f84 (patch)
tree	0a0487d6907041d437b6a64fea9e70338b17b71b /src/stdlib/wcstod.c
parent	043c6e31d9135c27875a1ccb4c0f1638f0170e77 (diff)
download	musl-f3ecdc1043f44468b2db794b259c5f66737f6f84.tar.gz

fix undefined behavior in wcsto[ld] family functions

analogous to commit b287cd745c2243f8e5114331763a5a9813b5f6ee but for the custom FILE stream type the wcstol and wcstod family use. __toread could be used here as well, but there's a simple direct fix to make the buffer pointers initially valid for subtraction, so just do that to avoid pulling in stdio exit code in programs that don't use stdio.

Diffstat (limited to 'src/stdlib/wcstod.c')

-rw-r--r--

src/stdlib/wcstod.c

1 files changed, 1 insertions, 2 deletions

diff --git a/src/stdlib/wcstod.c b/src/stdlib/wcstod.c
index 26fe9af8..0deb7010 100644
--- a/src/stdlib/wcstod.c
+++ b/src/stdlib/wcstod.c

@@ -33,8 +33,7 @@ static long double wcstox(const wchar_t *s, wchar_t **p, int prec)

unsigned char buf[64];

FILE f = {0};

f.flags = 0;

- f.rpos = f.rend = 0;

- f.buf = buf + 4;

+ f.rpos = f.rend = f.buf = buf + 4;

f.buf_size = sizeof buf - 4;

f.lock = -1;

f.read = do_read;

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