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perf annotate: Fix 's' on source line when disasm is empty 

If the disasm is empty, 's' should fail. Instead it seemingly works,
hiding the empty lines and causing an assertion error on the next time
annotate is called (from within perf report).

The problem is caused by a buffer overflow, caused by a wrong exit
condition in annotate_browser__find_next_asm_line, which checks
browser->b.top instead of browser->b.entries.

This patch fixes the issue, making annotate_browser__toggle_source
fail if the disasm is empty (nothing happens to the user).

Fixes: 6de249d66d ("perf annotate: Allow 's' on source code lines")
Signed-off-by: Riccardo Mancini <rickyman7@gmail.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Martin Liška <mliska@suse.cz>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20210705161524.72953-1-rickyman7@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Riccardo Mancini 2021-07-05 18:15:25 +02:00 committed by Arnaldo Carvalho de Melo
parent d5882a92ea
commit 5a4451e4d5
1 changed files with 2 additions and 2 deletions
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4
tools/perf/ui/browsers/annotate.c
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@ -350,14 +350,14 @@ static struct annotation_line *annotate_browser__find_next_asm_line(
struct annotation_line *it = al;
/* find next asm line */
list_for_each_entry_continue(it, browser->b.top, node) {
list_for_each_entry_continue(it, browser->b.entries, node) {
if (it->idx_asm >= 0)
return it;
}
/* no asm line found forwards, try backwards */
it = al;
list_for_each_entry_continue_reverse(it, browser->b.top, node) {
list_for_each_entry_continue_reverse(it, browser->b.entries, node) {
if (it->idx_asm >= 0)
return it;
}