From: Fernando Fernandez Mancera Date: Wed, 24 Jul 2019 07:31:14 +0000 (+0200) Subject: utils: nfnl_osf: fix snprintf -Wformat-truncation warning X-Git-Tag: v1.8.4~87 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=b1b24aec274728c5ceb914fc4511828432c3fbed;p=thirdparty%2Fiptables.git utils: nfnl_osf: fix snprintf -Wformat-truncation warning Fedora 30 uses very recent gcc (version 9.1.1 20190503 (Red Hat 9.1.1-1)), osf produces following warnings: -Wformat-truncation warning have been introduced in the version 7.1 of gcc. Also, remove a unneeded address check of "tmp + 1" in nf_osf_strchr(). nfnl_osf.c: In function ‘nfnl_osf_load_fingerprints’: nfnl_osf.c:346:33: warning: ‘%s’ directive output may be truncated writing up to 1023 bytes into a region of size 128 [-Wformat-truncation=] 346 | snprintf(obuf, sizeof(obuf), "%s,", pbeg); | ^~ nfnl_osf.c:346:3: note: ‘snprintf’ output between 2 and 1025 bytes into a destination of size 128 346 | snprintf(obuf, sizeof(obuf), "%s,", pbeg); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ nfnl_osf.c:354:40: warning: ‘%s’ directive output may be truncated writing up to 1023 bytes into a region of size 32 [-Wformat-truncation=] 354 | snprintf(f.genre, sizeof(f.genre), "%s", pbeg); | ^~ nfnl_osf.c:354:4: note: ‘snprintf’ output between 1 and 1024 bytes into a destination of size 32 354 | snprintf(f.genre, sizeof(f.genre), "%s", pbeg); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ nfnl_osf.c:363:43: warning: ‘%s’ directive output may be truncated writing up to 1023 bytes into a region of size 32 [-Wformat-truncation=] 363 | snprintf(f.version, sizeof(f.version), "%s", pbeg); | ^~ nfnl_osf.c:363:3: note: ‘snprintf’ output between 1 and 1024 bytes into a destination of size 32 363 | snprintf(f.version, sizeof(f.version), "%s", pbeg); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ nfnl_osf.c:370:47: warning: ‘%s’ directive output may be truncated writing up to 1023 bytes into a region of size 32 [-Wformat-truncation=] 370 | snprintf(f.subtype, sizeof(f.subtype), "%s", pbeg); | ^~ nfnl_osf.c:370:7: note: ‘snprintf’ output between 1 and 1024 bytes into a destination of size 32 370 | snprintf(f.subtype, sizeof(f.subtype), "%s", pbeg); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Signed-off-by: Fernando Fernandez Mancera Signed-off-by: Pablo Neira Ayuso --- diff --git a/utils/nfnl_osf.c b/utils/nfnl_osf.c index 0ea33fce..15d53197 100644 --- a/utils/nfnl_osf.c +++ b/utils/nfnl_osf.c @@ -343,31 +343,34 @@ static int osf_load_line(char *buffer, int len, int del) pend = xt_osf_strchr(pbeg, OSFPDEL); if (pend) { *pend = '\0'; - snprintf(obuf, sizeof(obuf), "%s,", pbeg); + i = sizeof(obuf); + snprintf(obuf, i, "%.*s,", i - 2, pbeg); pbeg = pend + 1; } pend = xt_osf_strchr(pbeg, OSFPDEL); if (pend) { *pend = '\0'; + i = sizeof(f.genre); if (pbeg[0] == '@' || pbeg[0] == '*') - snprintf(f.genre, sizeof(f.genre), "%s", pbeg + 1); - else - snprintf(f.genre, sizeof(f.genre), "%s", pbeg); + pbeg++; + snprintf(f.genre, i, "%.*s", i - 1, pbeg); pbeg = pend + 1; } pend = xt_osf_strchr(pbeg, OSFPDEL); if (pend) { *pend = '\0'; - snprintf(f.version, sizeof(f.version), "%s", pbeg); + i = sizeof(f.version); + snprintf(f.version, i, "%.*s", i - 1, pbeg); pbeg = pend + 1; } pend = xt_osf_strchr(pbeg, OSFPDEL); if (pend) { *pend = '\0'; - snprintf(f.subtype, sizeof(f.subtype), "%s", pbeg); + i = sizeof(f.subtype); + snprintf(f.subtype, i, "%.*s", i - 1, pbeg); } xt_osf_parse_opt(f.opt, &f.opt_num, obuf, sizeof(obuf));