Messages in this thread Patch in this message | | | From | Namhyung Kim <> | Subject | [PATCH 07/16] tools lib traceevent: Introduce extend_token() | Date | Wed, 4 Jul 2012 14:35:21 +0900 |
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From: Namhyung Kim <namhyung.kim@lge.com>
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@lge.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@infradead.org> Cc: Borislav Petkov <bp@alien8.de> Cc: David Ahern <dsahern@gmail.com> Link: http://lkml.kernel.org/r/1333940074-19052-4-git-send-email-namhyung.kim@lge.com [rostedt@goodmis.org: added some extra whitespace] Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Namhyung Kim <namhyung@kernel.org> --- tools/lib/traceevent/event-parse.c | 50 +++++++++++++++++------------------- 1 file changed, 24 insertions(+), 26 deletions(-)
diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c index 7815b8d2eabd..768fab5fbcb7 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) { -- 1.7.10.4
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