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Subject[tip: perf/core] perf annotate: Fix heap overflow
The following commit has been merged into the perf/core branch of tip:

Commit-ID: 5c65b1c0842f9daddc6aec4bdb4b5d898006be19
Gitweb: https://git.kernel.org/tip/5c65b1c0842f9daddc6aec4bdb4b5d898006be19
Author: Ian Rogers <irogers@google.com>
AuthorDate: Fri, 25 Oct 2019 20:56:44 -07:00
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitterDate: Thu, 07 Nov 2019 08:30:18 -03:00

perf annotate: Fix heap overflow

Fix expand_tabs that copies the source lines '\0' and then appends
another '\0' at a potentially out of bounds address.

Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20191026035644.217548-1-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/annotate.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index ef1866a..bee0fee 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -1892,7 +1892,7 @@ static char *expand_tabs(char *line, char **storage, size_t *storage_len)
}

/* Expand the last region. */
- len = line_len + 1 - src;
+ len = line_len - src;
memcpy(&new_line[dst], &line[src], len);
dst += len;
new_line[dst] = '\0';
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