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[QUEUED,v0,06/19] stm class: Fix an off-by-one in master array allocation

Message ID 1454690128-21994-7-git-send-email-alexander.shishkin@linux.intel.com
State New
Headers show

Commit Message

Alexander Shishkin Feb. 5, 2016, 4:35 p.m. UTC 
From: Chunyan Zhang <zhang.chunyan@linaro.org>


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>

---
 drivers/hwtracing/stm/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

-- 
2.7.0
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Patch

diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c
index ddcb606ace..40a8b79ab7 100644
--- a/drivers/hwtracing/stm/core.c
+++ b/drivers/hwtracing/stm/core.c
@@ -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;