[PATCH 14/16] tools lib traceevent: Check return value of arg_to_str()

From: Namhyung Kim
Date: Wed Jul 04 2012 - 01:40:28 EST


From: Namhyung Kim <namhyung.kim@xxxxxxx>

The arg_to_str() can fail so we should handle that case properly.

Signed-off-by: Namhyung Kim <namhyung.kim@xxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Link: http://lkml.kernel.org/r/1335157118-14658-12-git-send-email-namhyung.kim@xxxxxxx
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
---
tools/lib/traceevent/parse-filter.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/tools/lib/traceevent/parse-filter.c b/tools/lib/traceevent/parse-filter.c
index d54c2b4dbd9f..f020ac61f9c1 100644
--- a/tools/lib/traceevent/parse-filter.c
+++ b/tools/lib/traceevent/parse-filter.c
@@ -2026,11 +2026,13 @@ static char *exp_to_str(struct event_filter *filter, struct filter_arg *arg)
char *lstr;
char *rstr;
char *op;
- char *str;
+ char *str = NULL;
int len;

lstr = arg_to_str(filter, arg->exp.left);
rstr = arg_to_str(filter, arg->exp.right);
+ if (!lstr || !rstr)
+ goto out;

switch (arg->exp.type) {
case FILTER_EXP_ADD:
@@ -2070,6 +2072,7 @@ static char *exp_to_str(struct event_filter *filter, struct filter_arg *arg)
len = strlen(op) + strlen(lstr) + strlen(rstr) + 4;
str = malloc_or_die(len);
snprintf(str, len, "%s %s %s", lstr, op, rstr);
+out:
free(lstr);
free(rstr);

@@ -2086,6 +2089,8 @@ static char *num_to_str(struct event_filter *filter, struct filter_arg *arg)

lstr = arg_to_str(filter, arg->num.left);
rstr = arg_to_str(filter, arg->num.right);
+ if (!lstr || !rstr)
+ goto out;

switch (arg->num.type) {
case FILTER_CMP_EQ:
@@ -2122,6 +2127,7 @@ static char *num_to_str(struct event_filter *filter, struct filter_arg *arg)
break;
}

+out:
free(lstr);
free(rstr);
return str;
@@ -2272,7 +2278,12 @@ int pevent_filter_compare(struct event_filter *filter1, struct event_filter *fil
/* The best way to compare complex filters is with strings */
str1 = arg_to_str(filter1, filter_type1->filter);
str2 = arg_to_str(filter2, filter_type2->filter);
- result = strcmp(str1, str2) != 0;
+ if (str1 && str2)
+ result = strcmp(str1, str2) != 0;
+ else
+ /* bail out if allocation fails */
+ result = 1;
+
free(str1);
free(str2);
if (result)
--
1.7.10.4

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