Commit-ID: deba3fb26fd1ed3235b00dccced9784a7f76ec3c
Gitweb: http://git.kernel.org/tip/deba3fb26fd1ed3235b00dccced9784a7f76ec3c
Author: Namhyung Kim <namhyung.kim@xxxxxxx>
AuthorDate: Mon, 9 Apr 2012 11:54:30 +0900
Committer: Namhyung Kim <namhyung@xxxxxxxxxx>
CommitDate: Wed, 4 Jul 2012 13:40:31 +0900
tools lib traceevent: Introduce extend_token()
The __read_token() function has some duplicated code to handle
internal buffer overflow. Factor them out to new extend_token().
According to the man pages of realloc/free(3), they can handle NULL
pointer input so that it can be ended up to compact the code. Also
handle error path correctly.
Signed-off-by: Namhyung Kim <namhyung.kim@xxxxxxx>
Cc: Frederic Weisbecker <fweisbec@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/1333940074-19052-4-git-send-email-namhyung.kim@xxxxxxx
[rostedt@xxxxxxxxxxx: added some extra whitespace]
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
---
tools/lib/traceevent/event-parse.c | 52 +++++++++++++++++------------------
1 files changed, 25 insertions(+), 27 deletions(-)
diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index 7815b8d..768fab5 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -781,6 +781,25 @@ int pevent_peek_char(void)
return __peek_char();
}
+static int extend_token(char **tok, char *buf, int size)
+{
+ char *newtok = realloc(*tok, size);
+
+ if (!newtok) {
+ free(*tok);
+ *tok = NULL;
+ return -1;
+ }
+
+ if (!*tok)
+ strcpy(newtok, buf);
+ else
+ strcat(newtok, buf);
+ *tok = newtok;
+
+ return 0;
+}
+
static enum event_type force_token(const char *str, char **tok);
static enum event_type __read_token(char **tok)
@@ -865,17 +884,10 @@ static enum event_type __read_token(char **tok)
do {
if (i == (BUFSIZ - 1)) {
buf[i] = 0;
- if (*tok) {
- *tok = realloc(*tok, tok_size + BUFSIZ);
- if (!*tok)
- return EVENT_NONE;
- strcat(*tok, buf);
- } else
- *tok = strdup(buf);
+ tok_size += BUFSIZ;
- if (!*tok)
+ if (extend_token(tok, buf, tok_size) < 0)
return EVENT_NONE;
- tok_size += BUFSIZ;
i = 0;
}
last_ch = ch;
@@ -914,17 +926,10 @@ static enum event_type __read_token(char **tok)
while (get_type(__peek_char()) == type) {
if (i == (BUFSIZ - 1)) {
buf[i] = 0;
- if (*tok) {
- *tok = realloc(*tok, tok_size + BUFSIZ);
- if (!*tok)
- return EVENT_NONE;
- strcat(*tok, buf);
- } else
- *tok = strdup(buf);
+ tok_size += BUFSIZ;
- if (!*tok)
+ if (extend_token(tok, buf, tok_size) < 0)
return EVENT_NONE;
- tok_size += BUFSIZ;
i = 0;
}
ch = __read_char();
@@ -933,14 +938,7 @@ static enum event_type __read_token(char **tok)
out:
buf[i] = 0;
- if (*tok) {
- *tok = realloc(*tok, tok_size + i);
- if (!*tok)
- return EVENT_NONE;
- strcat(*tok, buf);
- } else
- *tok = strdup(buf);
- if (!*tok)
+ if (extend_token(tok, buf, tok_size + i + 1) < 0)
return EVENT_NONE;
if (type == EVENT_ITEM) {
--
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