Re: [PATCH] pinctrl: pinctrl-zynqmp: Use devm_kcalloc() instead of devm_kzalloc()
From: Gustavo A. R. Silva <hidden>
Date: 2024-01-19 18:26:40
Also in:
linux-gpio, linux-hardening, lkml
On 1/19/24 12:19, Erick Archer wrote:
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 purpose specific devm_kcalloc() function instead of the argument size * count in the devm_kzalloc() function. Link: https://www.kernel.org/doc/html/next/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments [1] Link: https://github.com/KSPP/linux/issues/162 Signed-off-by: Erick Archer <redacted>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org> Thanks! -- Gustavo
quoted hunk ↗ jump to hunk
--- drivers/pinctrl/pinctrl-zynqmp.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)diff --git a/drivers/pinctrl/pinctrl-zynqmp.c b/drivers/pinctrl/pinctrl-zynqmp.c index f2be341f73e1..5c46b7d7ebcb 100644 --- a/drivers/pinctrl/pinctrl-zynqmp.c +++ b/drivers/pinctrl/pinctrl-zynqmp.c@@ -562,7 +562,7 @@ static int zynqmp_pinctrl_prepare_func_groups(struct device *dev, u32 fid, const char **fgroups; int ret, index, i; - fgroups = devm_kzalloc(dev, sizeof(*fgroups) * func->ngroups, GFP_KERNEL); + fgroups = devm_kcalloc(dev, func->ngroups, sizeof(*fgroups), GFP_KERNEL); if (!fgroups) return -ENOMEM;@@ -754,7 +754,7 @@ static int zynqmp_pinctrl_prepare_function_info(struct device *dev, if (ret) return ret; - funcs = devm_kzalloc(dev, sizeof(*funcs) * pctrl->nfuncs, GFP_KERNEL); + funcs = devm_kcalloc(dev, pctrl->nfuncs, sizeof(*funcs), GFP_KERNEL); if (!funcs) return -ENOMEM;@@ -768,7 +768,7 @@ static int zynqmp_pinctrl_prepare_function_info(struct device *dev, pctrl->ngroups += funcs[i].ngroups; } - groups = devm_kzalloc(dev, sizeof(*groups) * pctrl->ngroups, GFP_KERNEL); + groups = devm_kcalloc(dev, pctrl->ngroups, sizeof(*groups), GFP_KERNEL); if (!groups) return -ENOMEM;@@ -830,7 +830,7 @@ static int zynqmp_pinctrl_prepare_pin_desc(struct device *dev, if (ret) return ret; - pins = devm_kzalloc(dev, sizeof(*pins) * *npins, GFP_KERNEL); + pins = devm_kcalloc(dev, *npins, sizeof(*pins), GFP_KERNEL); if (!pins) return -ENOMEM; --2.25.1
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