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:292:39: warning: ‘%s’ directive output may be truncated writing
up to 1023 bytes into a region of size 128 [-Wformat-truncation=]
292 | cnt = snprintf(obuf, sizeof(obuf), "%s,", pbeg);
| ^~
nfnl_osf.c:292:9: note: ‘snprintf’ output between 2 and 1025 bytes into a
destination of size 128
292 | cnt = snprintf(obuf, sizeof(obuf), "%s,", pbeg);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
nfnl_osf.c:302:46: warning: ‘%s’ directive output may be truncated writing
up to 1023 bytes into a region of size 32 [-Wformat-truncation=]
302 | cnt = snprintf(f.genre, sizeof(f.genre), "%s", pbeg);
| ^~
nfnl_osf.c:302:10: note: ‘snprintf’ output between 1 and 1024 bytes into a
destination of size 32
302 | cnt = snprintf(f.genre, sizeof(f.genre), "%s", pbeg);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
nfnl_osf.c:309:49: warning: ‘%s’ directive output may be truncated writing
up to 1023 bytes into a region of size 32 [-Wformat-truncation=]
309 | cnt = snprintf(f.version, sizeof(f.version), "%s", pbeg);
| ^~
nfnl_osf.c:309:9: note: ‘snprintf’ output between 1 and 1024 bytes into a
destination of size 32
309 | cnt = snprintf(f.version, sizeof(f.version), "%s", pbeg);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
nfnl_osf.c:317:47: warning: ‘%s’ directive output may be truncated writing
up to 1023 bytes into a region of size 32 [-Wformat-truncation=]
317 | snprintf(f.subtype, sizeof(f.subtype), "%s", pbeg);
| ^~
nfnl_osf.c:317:7: note: ‘snprintf’ output between 1 and 1024 bytes into a
destination of size 32
317 | snprintf(f.subtype, sizeof(f.subtype), "%s", pbeg);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Reported-by: Florian Westphal <fw@xxxxxxxxx>
Signed-off-by: Fernando Fernandez Mancera <ffmancera@xxxxxxxxxx>
---
v1: initial patch
v2: add Phil's changes
v3: get rid of pointless asignments
---
src/nfnl_osf.c | 19 ++++++++++---------
1 file changed, 10 insertions(+), 9 deletions(-)
diff --git a/src/nfnl_osf.c b/src/nfnl_osf.c
index be3fd81..08e978d 100644
--- a/src/nfnl_osf.c
+++ b/src/nfnl_osf.c
@@ -81,7 +81,7 @@ static char *nf_osf_strchr(char *ptr, char c)
if (tmp)
*tmp = '\0';
- while (tmp && tmp + 1 && isspace(*(tmp + 1)))
+ while (tmp && isspace(*(tmp + 1)))
tmp++;
return tmp;
@@ -98,7 +98,6 @@ static void nf_osf_parse_opt(struct nf_osf_opt *opt, __u16 *optnum, char *obuf,
i = 0;
while (ptr != NULL && i < olen && *ptr != 0) {
val = 0;
- op = 0;
wc = OSF_WSS_PLAIN;
switch (obuf[i]) {
case 'N':
@@ -289,32 +288,34 @@ static int osf_load_line(char *buffer, int len, int del,
pend = nf_osf_strchr(pbeg, OSFPDEL);
if (pend) {
*pend = '\0';
- cnt = snprintf(obuf, sizeof(obuf), "%s,", pbeg);
+ i = sizeof(obuf);
+ snprintf(obuf, i, "%.*s,", i - 2, pbeg);
pbeg = pend + 1;
}
pend = nf_osf_strchr(pbeg, OSFPDEL);
if (pend) {
*pend = '\0';
+ i = sizeof(f.genre);
if (pbeg[0] == '@' || pbeg[0] == '*')
- cnt = snprintf(f.genre, sizeof(f.genre), "%s", pbeg + 1);
- else
- cnt = snprintf(f.genre, sizeof(f.genre), "%s", pbeg);
+ pbeg++;
+ snprintf(f.genre, i, "%.*s", i - 1, pbeg);
pbeg = pend + 1;
}
pend = nf_osf_strchr(pbeg, OSFPDEL);
if (pend) {
*pend = '\0';
- cnt = snprintf(f.version, sizeof(f.version), "%s", pbeg);
+ i = sizeof(f.version);
+ snprintf(f.version, i, "%.*s", i - 1, pbeg);
pbeg = pend + 1;
}
pend = nf_osf_strchr(pbeg, OSFPDEL);
if (pend) {
*pend = '\0';
- cnt =
- snprintf(f.subtype, sizeof(f.subtype), "%s", pbeg);
+ i = sizeof(f.subtype);
+ snprintf(f.subtype, i, "%.*s", i - 1, pbeg);
pbeg = pend + 1;
}
--
2.20.1
