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stm class: Fix an off-by-one in master array allocation 

Since both sw_start and sw_end are master indices, the size of array
that holds them is sw_end - sw_start + 1, which the current code gets
wrong, allocating one item less than required.

This patch corrects the allocation size, avoiding potential slab
corruption.

Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
[alexander.shishkin@linux.intel.com: re-wrote the commit message]
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chunyan Zhang 2015-12-22 17:25:20 +02:00 committed by Greg Kroah-Hartman
parent c74f7e8281
commit 7b3bb0e753
1 changed files with 1 additions and 1 deletions
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2
drivers/hwtracing/stm/core.c
View File

@ -618,7 +618,7 @@ int stm_register_device(struct device *parent, struct stm_data *stm_data,
if (!stm_data->packet || !stm_data->sw_nchannels)
return -EINVAL;
nmasters = stm_data->sw_end - stm_data->sw_start;
nmasters = stm_data->sw_end - stm_data->sw_start + 1;
stm = kzalloc(sizeof(*stm) + nmasters * sizeof(void *), GFP_KERNEL);
if (!stm)
return -ENOMEM;