* [PATCH] tools: net: traceevent: Fix 'snprintf' return value check in 'tep_filter_strerror'
@ 2020-10-15 14:30 ` Fedor Tokarev
0 siblings, 0 replies; 5+ messages in thread
From: Fedor Tokarev @ 2020-10-15 14:30 UTC (permalink / raw)
To: rostedt, acme; +Cc: linux-kernel, kernel-janitors, ftokarev
'snprintf' returns the number of characters which would have been written
if enough space had been available, excluding the terminating null byte.
Thus, the return value of 'buflen' means that the last character
was dropped.
Signed-off-by: Fedor Tokarev <ftokarev@gmail.com>
---
tools/lib/traceevent/parse-filter.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/lib/traceevent/parse-filter.c b/tools/lib/traceevent/parse-filter.c
index c271aee..dccdbf2 100644
--- a/tools/lib/traceevent/parse-filter.c
+++ b/tools/lib/traceevent/parse-filter.c
@@ -1374,7 +1374,7 @@ int tep_filter_strerror(struct tep_event_filter *filter, enum tep_errno err,
if (strlen(filter->error_buffer) > 0) {
size_t len = snprintf(buf, buflen, "%s", filter->error_buffer);
- if (len > buflen)
+ if (len >= buflen)
return -1;
return 0;
}
--
2.7.4
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH] tools: net: traceevent: Fix 'snprintf' return value check in 'tep_filter_strerror'
@ 2020-10-15 14:30 ` Fedor Tokarev
0 siblings, 0 replies; 5+ messages in thread
From: Fedor Tokarev @ 2020-10-15 14:30 UTC (permalink / raw)
To: rostedt, acme; +Cc: linux-kernel, kernel-janitors, ftokarev
'snprintf' returns the number of characters which would have been written
if enough space had been available, excluding the terminating null byte.
Thus, the return value of 'buflen' means that the last character
was dropped.
Signed-off-by: Fedor Tokarev <ftokarev@gmail.com>
---
tools/lib/traceevent/parse-filter.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/lib/traceevent/parse-filter.c b/tools/lib/traceevent/parse-filter.c
index c271aee..dccdbf2 100644
--- a/tools/lib/traceevent/parse-filter.c
+++ b/tools/lib/traceevent/parse-filter.c
@@ -1374,7 +1374,7 @@ int tep_filter_strerror(struct tep_event_filter *filter, enum tep_errno err,
if (strlen(filter->error_buffer) > 0) {
size_t len = snprintf(buf, buflen, "%s", filter->error_buffer);
- if (len > buflen)
+ if (len >= buflen)
return -1;
return 0;
}
--
2.7.4
^ permalink raw reply related [flat|nested] 5+ messages in thread* AW: [PATCH] tools: net: traceevent: Fix 'snprintf' return value check in 'tep_filter_strerror'
2020-10-15 14:30 ` Fedor Tokarev
(?)
@ 2020-10-15 15:12 ` Walter Harms
2020-10-15 15:18 ` Steven Rostedt
-1 siblings, 1 reply; 5+ messages in thread
From: Walter Harms @ 2020-10-15 15:12 UTC (permalink / raw)
To: Fedor Tokarev, rostedt, acme; +Cc: linux-kernel, kernel-janitors
i guess the whole thing can be made more simple
we have len and buflen
len=strlen(filter->error_buffer);
if (len >= buflen )
return -1;
strcpy(buf, filter->error_buffer);
jm2c,
________________________________________
Von: Fedor Tokarev [ftokarev@gmail.com]
Gesendet: Donnerstag, 15. Oktober 2020 16:30
An: rostedt@goodmis.org; acme@redhat.com
Cc: linux-kernel@vger.kernel.org; kernel-janitors@vger.kernel.org; ftokarev@gmail.com
Betreff: [PATCH] tools: net: traceevent: Fix 'snprintf' return value check in 'tep_filter_strerror'
'snprintf' returns the number of characters which would have been written
if enough space had been available, excluding the terminating null byte.
Thus, the return value of 'buflen' means that the last character
was dropped.
Signed-off-by: Fedor Tokarev <ftokarev@gmail.com>
---
tools/lib/traceevent/parse-filter.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/lib/traceevent/parse-filter.c b/tools/lib/traceevent/parse-filter.c
index c271aee..dccdbf2 100644
--- a/tools/lib/traceevent/parse-filter.c
+++ b/tools/lib/traceevent/parse-filter.c
@@ -1374,7 +1374,7 @@ int tep_filter_strerror(struct tep_event_filter *filter, enum tep_errno err,
if (strlen(filter->error_buffer) > 0) {
size_t len = snprintf(buf, buflen, "%s", filter->error_buffer);
- if (len > buflen)
+ if (len >= buflen)
return -1;
return 0;
}
--
2.7.4
^ permalink raw reply related [flat|nested] 5+ messages in thread
end of thread, other threads:[~2020-10-15 15:18 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2020-10-15 14:30 [PATCH] tools: net: traceevent: Fix 'snprintf' return value check in 'tep_filter_strerror' Fedor Tokarev
2020-10-15 14:30 ` Fedor Tokarev
2020-10-15 15:12 ` AW: " Walter Harms
2020-10-15 15:18 ` Steven Rostedt
2020-10-15 15:18 ` Steven Rostedt
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