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| author | Len Baker <len.baker@gmx.com> | 2021-09-05 16:40:54 +0200 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2021-12-10 15:54:45 +0100 |
| commit | f96b2e77f6d1b0c5181e0eae3dc60a00a5cd692a (patch) | |
| tree | a8c070028e38b46259963bfcb6322acbb4b137e4 /drivers/i3c | |
| parent | Linux 5.16-rc1 (diff) | |
| download | linux-f96b2e77f6d1b0c5181e0eae3dc60a00a5cd692a.tar.xz linux-f96b2e77f6d1b0c5181e0eae3dc60a00a5cd692a.zip | |
i3c/master/mipi-i3c-hci: Prefer struct_size over open coded arithmetic
As noted in the "Deprecated Interfaces, Language Features, Attributes,
and Conventions" documentation [1], size calculations (especially
multiplication) should not be performed in memory allocator (or similar)
function arguments due to the risk of them overflowing. This could lead
to values wrapping around and a smaller allocation being made than the
caller was expecting. Using those allocations could lead to linear
overflows of heap memory and other misbehaviors.
So, use the struct_size() helper to do the arithmetic instead of the
argument "size + count * size" in the kzalloc() function.
[1] https://www.kernel.org/doc/html/v5.14/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments
Signed-off-by: Len Baker <len.baker@gmx.com>
Acked-by: Nicolas Pitre <npitre@baylibre.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210905144054.5124-1-len.baker@gmx.com
Diffstat (limited to 'drivers/i3c')
| -rw-r--r-- | drivers/i3c/master/mipi-i3c-hci/dma.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/i3c/master/mipi-i3c-hci/dma.c b/drivers/i3c/master/mipi-i3c-hci/dma.c index af873a9be050..2990ac9eaade 100644 --- a/drivers/i3c/master/mipi-i3c-hci/dma.c +++ b/drivers/i3c/master/mipi-i3c-hci/dma.c @@ -223,7 +223,7 @@ static int hci_dma_init(struct i3c_hci *hci) } if (nr_rings > XFER_RINGS) nr_rings = XFER_RINGS; - rings = kzalloc(sizeof(*rings) + nr_rings * sizeof(*rh), GFP_KERNEL); + rings = kzalloc(struct_size(rings, headers, nr_rings), GFP_KERNEL); if (!rings) return -ENOMEM; hci->io_data = rings; |