diff options
| author | Alexander Shishkin <alexander.shishkin@linux.intel.com> | 2019-04-17 10:35:35 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-04-25 11:31:17 +0200 |
| commit | 51e0f227812ed81a368de54157ebe14396b4be03 (patch) | |
| tree | 216127d45b587ed6685b798eecd942379b148e1b /drivers/hwtracing/stm | |
| parent | ee496da4c3915de3232b5f5cd20e21ae3e46fe8d (diff) | |
| download | linux-51e0f227812ed81a368de54157ebe14396b4be03.tar.bz2 | |
stm class: Fix channel bitmap on 32-bit systems
Commit 7bd1d4093c2f ("stm class: Introduce an abstraction for System Trace
Module devices") naively calculates the channel bitmap size in 64-bit
chunks regardless of the size of underlying unsigned long, making the
bitmap half as big on a 32-bit system. This leads to an out of bounds
access with the upper half of the bitmap.
Fix this by using BITS_TO_LONGS. While at it, convert to using
struct_size() for the total size calculation of the master struct.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Fixes: 7bd1d4093c2f ("stm class: Introduce an abstraction for System Trace Module devices")
Reported-by: Mulu He <muluhe@codeaurora.org>
Cc: stable@vger.kernel.org # v4.4+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing/stm')
| -rw-r--r-- | drivers/hwtracing/stm/core.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c index 5b5807cbcf7c..e55b902560de 100644 --- a/drivers/hwtracing/stm/core.c +++ b/drivers/hwtracing/stm/core.c @@ -166,11 +166,10 @@ stm_master(struct stm_device *stm, unsigned int idx) static int stp_master_alloc(struct stm_device *stm, unsigned int idx) { struct stp_master *master; - size_t size; - size = ALIGN(stm->data->sw_nchannels, 8) / 8; - size += sizeof(struct stp_master); - master = kzalloc(size, GFP_ATOMIC); + master = kzalloc(struct_size(master, chan_map, + BITS_TO_LONGS(stm->data->sw_nchannels)), + GFP_ATOMIC); if (!master) return -ENOMEM; |