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Have ftrace lookup_rec() return a consistent record otherwise it

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can break live patching.
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Merge tag 'trace-v5.6-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull ftrace fix from Steven Rostedt:
 "Have ftrace lookup_rec() return a consistent record otherwise it can
  break live patching"

* tag 'trace-v5.6-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  ftrace: Return the first found result in lookup_rec()
This commit is contained in:
Linus Torvalds 2020-03-11 09:54:59 -07:00
commit 36feb99630
1 changed files with 2 additions and 0 deletions
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2
kernel/trace/ftrace.c
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@ -1547,6 +1547,8 @@ static struct dyn_ftrace *lookup_rec(unsigned long start, unsigned long end)
rec = bsearch(&key, pg->records, pg->index, rec = bsearch(&key, pg->records, pg->index,
sizeof(struct dyn_ftrace), sizeof(struct dyn_ftrace),
ftrace_cmp_recs); ftrace_cmp_recs);
if (rec)
break;
} }
return rec; return rec;
} }