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author | Gustavo A. R. Silva <gustavo@embeddedor.com> | 2018-08-23 18:06:54 -0500 |
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committer | Stephen Boyd <sboyd@kernel.org> | 2018-08-28 15:12:59 -0700 |
commit | 450b6b9b169382205f88858541a8b79830262ce7 (patch) | |
tree | bd9fc3f1b4ffae47e80d37dbf8f4c054850ceca0 /drivers/clk/clk-npcm7xx.c | |
parent | 5b394b2ddf0347bef56e50c69a58773c94343ff3 (diff) | |
download | linux-450b6b9b169382205f88858541a8b79830262ce7.tar.gz linux-450b6b9b169382205f88858541a8b79830262ce7.tar.bz2 linux-450b6b9b169382205f88858541a8b79830262ce7.zip |
clk: npcm7xx: fix memory allocation
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>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Avi Fishman <avifishman70@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Diffstat (limited to 'drivers/clk/clk-npcm7xx.c')
-rw-r--r-- | drivers/clk/clk-npcm7xx.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/clk/clk-npcm7xx.c b/drivers/clk/clk-npcm7xx.c index 740af90a9508..c5edf8f2fd19 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; |