perf symbol: Fix uninitialized return value in symbols__find_by_name()

found_idx and s aren't initialized, so if no symbol is found then the
assert at the end will index off the end of the array causing a
segfault. The function also doesn't return NULL when the symbol isn't
found even if the assert passes. Fix it by initializing the values and
only setting them when something is found.

Fixes the following test failure:

  $ perf test 1
  1: vmlinux symtab matches kallsyms     : FAILED!

Fixes: 259dce914e93 ("perf symbol: Remove symbol_name_rb_node")
Signed-off-by: James Clark <james.clark@arm.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Link: https://lore.kernel.org/r/20230630153840.858668-1-james.clark@arm.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index bc79291b9f3bd399a671252fb066af09498ad6f8..f849f9ef68e6c1629d59ebf5a94824bad1a45fd7 100644 (file)
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -495,7 +495,10 @@ static struct symbol *symbols__find_by_name(struct symbol *symbols[],
                                            size_t *found_idx)
 {
        size_t i, lower = 0, upper = symbols_len;
-       struct symbol *s;
+       struct symbol *s = NULL;
+
+       if (found_idx)
+               *found_idx = SIZE_MAX;
 
        if (!symbols_len)
                return NULL;
@@ -504,8 +507,7 @@ static struct symbol *symbols__find_by_name(struct symbol *symbols[],
                int cmp;
 
                i = (lower + upper) / 2;
-               s = symbols[i];
-               cmp = symbol__match_symbol_name(s->name, name, includes);
+               cmp = symbol__match_symbol_name(symbols[i]->name, name, includes);
 
                if (cmp > 0)
                        upper = i;
@@ -514,10 +516,11 @@ static struct symbol *symbols__find_by_name(struct symbol *symbols[],
                else {
                        if (found_idx)
                                *found_idx = i;
+                       s = symbols[i];
                        break;
                }
        }
-       if (includes != SYMBOL_TAG_INCLUDE__DEFAULT_ONLY) {
+       if (s && includes != SYMBOL_TAG_INCLUDE__DEFAULT_ONLY) {
                /* return first symbol that has same name (if any) */
                for (; i > 0; i--) {
                        struct symbol *tmp = symbols[i - 1];
@@ -525,13 +528,12 @@ static struct symbol *symbols__find_by_name(struct symbol *symbols[],
                        if (!arch__compare_symbol_names(tmp->name, s->name)) {
                                if (found_idx)
                                        *found_idx = i - 1;
+                               s = tmp;
                        } else
                                break;
-
-                       s = tmp;
                }
        }
-       assert(!found_idx || s == symbols[*found_idx]);
+       assert(!found_idx || !s || s == symbols[*found_idx]);
        return s;
 }