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| author | Len Baker <len.baker@gmx.com> | 2021-09-11 16:19:33 +0300 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2021-10-12 11:21:17 +0300 |
| commit | 16e9bde21ab6592aa55f1d3cb29338117c84cea5 (patch) | |
| tree | 0a09f471fd221bb9a8846587c0512934cc99bc89 | |
| parent | d47f163c7794ce93e762897dcb6a956b3421b368 (diff) | |
| download | linux-16e9bde21ab6592aa55f1d3cb29338117c84cea5.tar.xz | |
memstick: jmb38x_ms: 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>
Link: https://lore.kernel.org/r/20210911131933.2089-1-len.baker@gmx.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
| -rw-r--r-- | drivers/memstick/host/jmb38x_ms.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/memstick/host/jmb38x_ms.c b/drivers/memstick/host/jmb38x_ms.c index f9a93b0565e1..a7a0f0caea15 100644 --- a/drivers/memstick/host/jmb38x_ms.c +++ b/drivers/memstick/host/jmb38x_ms.c @@ -927,8 +927,7 @@ static int jmb38x_ms_probe(struct pci_dev *pdev, goto err_out_int; } - jm = kzalloc(sizeof(struct jmb38x_ms) - + cnt * sizeof(struct memstick_host *), GFP_KERNEL); + jm = kzalloc(struct_size(jm, hosts, cnt), GFP_KERNEL); if (!jm) { rc = -ENOMEM; goto err_out_int; |