perf tools: Make alias handler to check return value of strbuf

Make alias handler and sq_quote_argv to check the return value of strbuf
APIs.

In sq_quote_argv() calls die(), but this fix handles strbuf failure as a
special case and returns to caller, since the caller - handle_alias()
also has to check the return value of other strbuf APIs and those checks
can be merged to one if() statement.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20160510054725.6158.84597.stgit@devbox
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 83ffe7c..7970008 100644 (file)
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -309,9 +309,11 @@ static int handle_alias(int *argcp, const char ***argv)
                        if (*argcp > 1) {
                                struct strbuf buf;
 
-                               strbuf_init(&buf, PATH_MAX);
-                               strbuf_addstr(&buf, alias_string);
-                               sq_quote_argv(&buf, (*argv) + 1, PATH_MAX);
+                               if (strbuf_init(&buf, PATH_MAX) < 0 ||
+                                   strbuf_addstr(&buf, alias_string) < 0 ||
+                                   sq_quote_argv(&buf, (*argv) + 1,
+                                                 PATH_MAX) < 0)
+                                       die("Failed to allocate memory.");
                                free(alias_string);
                                alias_string = buf.buf;
                        }

diff --git a/tools/perf/util/quote.c b/tools/perf/util/quote.c
index 01f0324..c6d4ee2 100644 (file)
--- a/tools/perf/util/quote.c
+++ b/tools/perf/util/quote.c
@@ -17,38 +17,42 @@ static inline int need_bs_quote(char c)
        return (c == '\'' || c == '!');
 }
 
-static void sq_quote_buf(struct strbuf *dst, const char *src)
+static int sq_quote_buf(struct strbuf *dst, const char *src)
 {
        char *to_free = NULL;
+       int ret;
 
        if (dst->buf == src)
                to_free = strbuf_detach(dst, NULL);
 
-       strbuf_addch(dst, '\'');
-       while (*src) {
+       ret = strbuf_addch(dst, '\'');
+       while (!ret && *src) {
                size_t len = strcspn(src, "'!");
-               strbuf_add(dst, src, len);
+               ret = strbuf_add(dst, src, len);
                src += len;
-               while (need_bs_quote(*src)) {
-                       strbuf_addstr(dst, "'\\");
-                       strbuf_addch(dst, *src++);
-                       strbuf_addch(dst, '\'');
-               }
+               while (!ret && need_bs_quote(*src))
+                       ret = strbuf_addf(dst, "'\\%c\'", *src++);
        }
-       strbuf_addch(dst, '\'');
+       if (!ret)
+               ret = strbuf_addch(dst, '\'');
        free(to_free);
+
+       return ret;
 }
 
-void sq_quote_argv(struct strbuf *dst, const char** argv, size_t maxlen)
+int sq_quote_argv(struct strbuf *dst, const char** argv, size_t maxlen)
 {
-       int i;
+       int i, ret;
 
        /* Copy into destination buffer. */
-       strbuf_grow(dst, 255);
-       for (i = 0; argv[i]; ++i) {
-               strbuf_addch(dst, ' ');
-               sq_quote_buf(dst, argv[i]);
+       ret = strbuf_grow(dst, 255);
+       for (i = 0; !ret && argv[i]; ++i) {
+               ret = strbuf_addch(dst, ' ');
+               if (ret)
+                       break;
+               ret = sq_quote_buf(dst, argv[i]);
                if (maxlen && dst->len > maxlen)
                        die("Too many or long arguments");
        }
+       return ret;
 }

diff --git a/tools/perf/util/quote.h b/tools/perf/util/quote.h
index 3340c9c..e1ec191 100644 (file)
--- a/tools/perf/util/quote.h
+++ b/tools/perf/util/quote.h
@@ -24,6 +24,6 @@
  * sq_quote() in a real application.
  */
 
-void sq_quote_argv(struct strbuf *, const char **argv, size_t maxlen);
+int sq_quote_argv(struct strbuf *, const char **argv, size_t maxlen);
 
 #endif /* __PERF_QUOTE_H */