Messages in this thread Patch in this message | | | Date | Thu, 23 Aug 2018 18:06:54 -0500 | From | "Gustavo A. R. Silva" <> | Subject | [PATCH] clk: npcm7xx: fix memory allocation |
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One of the more common cases of allocation size calculations is finding the size of a structure that has a zero-sized array at the end, along with memory for some number of elements for that array. For example:
struct foo { int stuff; void *entry[]; };
instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL);
Instead of leaving these open-coded and prone to type mistakes, we can now use the new struct_size() helper:
instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL);
Notice that, currently, there is a bug during the allocation: sizeof(npcm7xx_clk_data) should be sizeof(*npcm7xx_clk_data)
Fix this bug by using struct_size() in kzalloc()
This issue was detected with the help of Coccinelle.
Cc: stable@vger.kernel.org Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> --- drivers/clk/clk-npcm7xx.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/clk/clk-npcm7xx.c b/drivers/clk/clk-npcm7xx.c index 740af90..c5edf8f 100644 --- a/drivers/clk/clk-npcm7xx.c +++ b/drivers/clk/clk-npcm7xx.c @@ -558,8 +558,8 @@ static void __init npcm7xx_clk_init(struct device_node *clk_np) if (!clk_base) goto npcm7xx_init_error; - npcm7xx_clk_data = kzalloc(sizeof(*npcm7xx_clk_data->hws) * - NPCM7XX_NUM_CLOCKS + sizeof(npcm7xx_clk_data), GFP_KERNEL); + npcm7xx_clk_data = kzalloc(struct_size(npcm7xx_clk_data, hws, + NPCM7XX_NUM_CLOCKS), GFP_KERNEL); if (!npcm7xx_clk_data) goto npcm7xx_init_np_err; -- 2.7.4
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