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fix iconv buffer overflow converting to legacy JIS-based encodings

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maintainer's notes:

commit a223dbd27ae36fe53f9f67f86caf685b729593fc added the reverse
conversions to JIS-based encodings, but omitted the check for remining
buffer space in the case where the next character to be written was
single-byte, allowing conversion to continue past the end of the
destination buffer.
This commit is contained in:
Will Dietz 2018-05-01 14:16:44 -05:00 committed by Rich Felker
parent 40bae2d32f
commit 55a661ff5e
1 changed files with 1 additions and 0 deletions
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src/locale/iconv.c
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@ -539,6 +539,7 @@ size_t iconv(iconv_t cd, char **restrict in, size_t *restrict inb, char **restri
if (*outb < 1) goto toobig; if (*outb < 1) goto toobig;
if (c<256 && c==legacy_map(tomap, c)) { if (c<256 && c==legacy_map(tomap, c)) {
revout: revout:
if (*outb < 1) goto toobig;
*(*out)++ = c; *(*out)++ = c;
*outb -= 1; *outb -= 1;
break; break;