1 files changed, 14 insertions, 7 deletions

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index d7e67b167ea3..7cba0551a565 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -265,15 +265,16 @@ int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
                           const char *name, bool is_kallsyms)
 {
         const size_t size = PATH_MAX;
-        char *filename = malloc(size),
+        char *realname = realpath(name, NULL),
+             *filename = malloc(size),
              *linkname = malloc(size), *targetname;
         int len, err = -1;
 
-        if (filename == NULL || linkname == NULL)
+        if (realname == NULL || filename == NULL || linkname == NULL)
                 goto out_free;
 
         len = snprintf(filename, size, "%s%s%s",
-                       debugdir, is_kallsyms ? "/" : "", name);
+                       debugdir, is_kallsyms ? "/" : "", realname);
         if (mkdir_p(filename, 0755))
                 goto out_free;
 
@@ -283,7 +284,7 @@ int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
                 if (is_kallsyms) {
                          if (copyfile("/proc/kallsyms", filename))
                                 goto out_free;
-                } else if (link(name, filename) && copyfile(name, filename))
+                } else if (link(realname, filename) && copyfile(name, filename))
                         goto out_free;
         }
 
@@ -300,6 +301,7 @@ int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
         if (symlink(targetname, linkname) == 0)
                 err = 0;
 out_free:
+        free(realname);
         free(filename);
         free(linkname);
         return err;
@@ -946,11 +948,16 @@ perf_header__find_attr(u64 id, struct perf_header *header)
 
         /*
          * We set id to -1 if the data file doesn't contain sample
-         * ids. Check for this and avoid walking through the entire
-         * list of ids which may be large.
+         * ids. This can happen when the data file contains one type
+         * of event and in that case, the header can still store the
+         * event attribute information. Check for this and avoid
+         * walking through the entire list of ids which may be large.
          */
-        if (id == -1ULL)
+        if (id == -1ULL) {
+                if (header->attrs > 0)
+                        return &header->attr[0]->attr;
                 return NULL;
+        }
 
         for (i = 0; i < header->attrs; i++) {
                 struct perf_header_attr *attr = header->attr[i];