From 08538f360f14dbe2e3b04a30148e342f248d9de5 Mon Sep 17 00:00:00 2001 From: Stefan Liebler Date: Tue, 16 Jun 2020 14:24:20 +0200 Subject: Fix stringop-overflow errors from gcc 10 in iconv. On s390x, I've recognize various -Werror=stringop-overflow messages in iconv/loop.c and iconv/skeleton.c if build with gcc10 -O3. With this commit gcc knows the size and do not raise those errors anymore. --- iconv/loop.c | 14 ++++++++------ iconv/skeleton.c | 8 +++++--- 2 files changed, 13 insertions(+), 9 deletions(-) (limited to 'iconv') diff --git a/iconv/loop.c b/iconv/loop.c index 9f7570d591..b032fcd9ac 100644 --- a/iconv/loop.c +++ b/iconv/loop.c @@ -420,8 +420,10 @@ SINGLE(LOOPFCT) (struct __gconv_step *step, # else /* We don't have enough input for another complete input character. */ - while (inptr < inend) - state->__value.__wchb[inlen++] = *inptr++; + size_t inlen_after = inlen + (inend - inptr); + assert (inlen_after <= sizeof (state->__value.__wchb)); + for (; inlen < inlen_after; inlen++) + state->__value.__wchb[inlen] = *inptr++; # endif return __GCONV_INCOMPLETE_INPUT; @@ -483,11 +485,11 @@ SINGLE(LOOPFCT) (struct __gconv_step *step, /* We don't have enough input for another complete input character. */ assert (inend - inptr > (state->__count & ~7)); - assert (inend - inptr <= sizeof (state->__value)); + assert (inend - inptr <= sizeof (state->__value.__wchb)); state->__count = (state->__count & ~7) | (inend - inptr); - inlen = 0; - while (inptr < inend) - state->__value.__wchb[inlen++] = *inptr++; + for (inlen = 0; inlen < inend - inptr; inlen++) + state->__value.__wchb[inlen] = inptr[inlen]; + inptr = inend; # endif } diff --git a/iconv/skeleton.c b/iconv/skeleton.c index 1dc642e2fc..1a38b51a5a 100644 --- a/iconv/skeleton.c +++ b/iconv/skeleton.c @@ -795,11 +795,13 @@ FUNCTION_NAME (struct __gconv_step *step, struct __gconv_step_data *data, # else /* Make sure the remaining bytes fit into the state objects buffer. */ - assert (inend - *inptrp < 4); + size_t cnt_after = inend - *inptrp; + assert (cnt_after <= sizeof (data->__statep->__value.__wchb)); size_t cnt; - for (cnt = 0; *inptrp < inend; ++cnt) - data->__statep->__value.__wchb[cnt] = *(*inptrp)++; + for (cnt = 0; cnt < cnt_after; ++cnt) + data->__statep->__value.__wchb[cnt] = (*inptrp)[cnt]; + *inptrp = inend; data->__statep->__count &= ~7; data->__statep->__count |= cnt; # endif -- cgit 1.4.1