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 <[email protected]>
Signed-off-by: Fernando Fernandez Mancera <[email protected]>
---
src/nfnl_osf.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/src/nfnl_osf.c b/src/nfnl_osf.c
index be3fd81..c99f8f3 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;
@@ -212,7 +212,7 @@ static int osf_load_line(char *buffer, int len, int del,
struct netlink_ctx *ctx)
{
int i, cnt = 0;
- char obuf[MAXOPTSTRLEN];
+ char obuf[MAXOPTSTRLEN + 1];
struct nf_osf_user_finger f;
char *pbeg, *pend;
struct nlmsghdr *nlh;
@@ -289,7 +289,7 @@ 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);
+ cnt = snprintf(obuf, sizeof(obuf), "%.128s", pbeg);
pbeg = pend + 1;
}
@@ -297,16 +297,16 @@ static int osf_load_line(char *buffer, int len, int del,
if (pend) {
*pend = '\0';
if (pbeg[0] == '@' || pbeg[0] == '*')
- cnt = snprintf(f.genre, sizeof(f.genre), "%s", pbeg +
1);
+ cnt = snprintf(f.genre, sizeof(f.genre), "%.31s", pbeg
+ 1);
else
- cnt = snprintf(f.genre, sizeof(f.genre), "%s", pbeg);
+ cnt = snprintf(f.genre, sizeof(f.genre), "%.31s", pbeg);
pbeg = pend + 1;
}
pend = nf_osf_strchr(pbeg, OSFPDEL);
if (pend) {
*pend = '\0';
- cnt = snprintf(f.version, sizeof(f.version), "%s", pbeg);
+ cnt = snprintf(f.version, sizeof(f.version), "%.31s", pbeg);
pbeg = pend + 1;
}
@@ -314,7 +314,7 @@ static int osf_load_line(char *buffer, int len, int del,
if (pend) {
*pend = '\0';
cnt =
- snprintf(f.subtype, sizeof(f.subtype), "%s", pbeg);
+ snprintf(f.subtype, sizeof(f.subtype), "%.31s", pbeg);
pbeg = pend + 1;
}
--
2.20.1
