diff options
| author | Ian Rogers <[email protected]> | 2021-04-07 08:39:55 -0700 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <[email protected]> | 2021-04-07 16:23:20 -0300 |
| commit | 92f1e8adf7db2ef9b90e5662182810c0cf8ac22e (patch) | |
| tree | c8506787800b6327587706e2540959a16102c59b | |
| parent | f2013278ae40b89cc27916366c407ce5261815ef (diff) | |
perf arm-spe: Avoid potential buffer overrun
SPE extended headers are > 1 byte so ensure the buffer contains at least
this before reading. This issue was detected by fuzzing.
Signed-off-by: Ian Rogers <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Andre Przywara <[email protected]>
Cc: Dave Martin <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Will Deacon <[email protected]>
Link: http://lore.kernel.org/lkml/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
| -rw-r--r-- | tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c b/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c index f3ac9d40cebf..2e5eff4f8f03 100644 --- a/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c +++ b/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c @@ -210,8 +210,10 @@ static int arm_spe_do_get_packet(const unsigned char *buf, size_t len, if ((hdr & SPE_HEADER0_MASK2) == SPE_HEADER0_EXTENDED) { /* 16-bit extended format header */ - ext_hdr = 1; + if (len == 1) + return ARM_SPE_BAD_PACKET; + ext_hdr = 1; hdr = buf[1]; if (hdr == SPE_HEADER1_ALIGNMENT) return arm_spe_get_alignment(buf, len, packet); |