perf annotate browser: Fix segfault when drawing out-of-bounds jumps

Factorize jump sanity checks from mark_jump_targets() and
draw_current_jump() in an is_valid_jump() function.

This fixes a segfault when moving the cursor over an invalid jump.

Signed-off-by: Frederik Deweerdt <frederik.deweerdt@xprog.eu>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/20130114194716.GA4973@ks398093.ip-192-95-24.net
[ committer note: Make it a disasm_line method ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/ui/browsers/annotate.c b/tools/perf/ui/browsers/annotate.c
index 5dab3ca..2fc7f04 100644 (file)
--- a/tools/perf/ui/browsers/annotate.c
+++ b/tools/perf/ui/browsers/annotate.c
@@ -182,6 +182,16 @@ static void annotate_browser__write(struct ui_browser *browser, void *entry, int
                ab->selection = dl;
 }
 
+static bool disasm_line__is_valid_jump(struct disasm_line *dl, struct symbol *sym)
+{
+       if (!dl || !dl->ins || !ins__is_jump(dl->ins)
+           || !disasm_line__has_offset(dl)
+           || dl->ops.target.offset >= symbol__size(sym))
+               return false;
+
+       return true;
+}
+
 static void annotate_browser__draw_current_jump(struct ui_browser *browser)
 {
        struct annotate_browser *ab = container_of(browser, struct annotate_browser, b);
@@ -195,8 +205,7 @@ static void annotate_browser__draw_current_jump(struct ui_browser *browser)
        if (strstr(sym->name, "@plt"))
                return;
 
-       if (!cursor || !cursor->ins || !ins__is_jump(cursor->ins) ||
-           !disasm_line__has_offset(cursor))
+       if (!disasm_line__is_valid_jump(cursor, sym))
                return;
 
        target = ab->offsets[cursor->ops.target.offset];
@@ -788,17 +797,9 @@ static void annotate_browser__mark_jump_targets(struct annotate_browser *browser
                struct disasm_line *dl = browser->offsets[offset], *dlt;
                struct browser_disasm_line *bdlt;
 
-               if (!dl || !dl->ins || !ins__is_jump(dl->ins) ||
-                   !disasm_line__has_offset(dl))
+               if (!disasm_line__is_valid_jump(dl, sym))
                        continue;
 
-               if (dl->ops.target.offset >= size) {
-                       ui__error("jump to after symbol!\n"
-                                 "size: %zx, jump target: %" PRIx64,
-                                 size, dl->ops.target.offset);
-                       continue;
-               }
-
                dlt = browser->offsets[dl->ops.target.offset];
                /*
                 * FIXME: Oops, no jump target? Buggy disassembler? Or do we
@@ -921,7 +922,7 @@ out_free_offsets:
 
 #define ANNOTATE_CFG(n) \
        { .name = #n, .value = &annotate_browser__opts.n, }
-       
+
 /*
  * Keep the entries sorted, they are bsearch'ed
  */