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Date: Sat, 11 Sep 2021 15:19:33 +0200 From: Len Baker <len.baker@....com> To: Maxim Levitsky <maximlevitsky@...il.com>, Alex Dubov <oakad@...oo.com>, Ulf Hansson <ulf.hansson@...aro.org> Cc: Len Baker <len.baker@....com>, Kees Cook <keescook@...omium.org>, Tom Rix <trix@...hat.com>, linux-hardening@...r.kernel.org, linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH] 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@....com> --- drivers/memstick/host/jmb38x_ms.c | 3 +-- 1 file changed, 1 insertion(+), 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; -- 2.25.1
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