4.19-stable review patch. If anyone has any objections, please let me know.
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From: Javier Carrasco javier.carrasco.cruz@gmail.com
[ Upstream commit 40176714c818b0b6a2ca8213cdb7654fbd49b742 ]
Commit 16c2004d9e4d ("mfd: omap-usb-tll: Allocate driver data at once") changed the memory allocation of 'tll' to consolidate it into a single allocation, introducing an incorrect size calculation.
In particular, the allocation for the array of pointers was converted into a single-pointer allocation.
The memory allocation used to occur in two steps:
tll = devm_kzalloc(dev, sizeof(struct usbtll_omap), GFP_KERNEL); tll->ch_clk = devm_kzalloc(dev, sizeof(struct clk *) * tll->nch, GFP_KERNEL);
And it turned that into the following allocation:
tll = devm_kzalloc(dev, sizeof(*tll) + sizeof(tll->ch_clk[nch]), GFP_KERNEL);
sizeof(tll->ch_clk[nch]) returns the size of a single pointer instead of the expected nch pointers.
This bug went unnoticed because the allocation size was small enough to fit within the minimum size of a memory allocation for this particular case [1].
The complete allocation can still be done at once with the struct_size macro, which comes in handy for structures with a trailing flexible array.
Fix the memory allocation to obtain the original size again.
Link: https://lore.kernel.org/all/202406261121.2FFD65647@keescook/ [1] Fixes: 16c2004d9e4d ("mfd: omap-usb-tll: Allocate driver data at once") Reviewed-by: Kees Cook kees@kernel.org Signed-off-by: Javier Carrasco javier.carrasco.cruz@gmail.com Fixes: commit 16c2004d9e4d ("mfd: omap-usb-tll: Allocate driver data at once") Link: https://lore.kernel.org/r/20240626-omap-usb-tll-counted_by-v2-1-4bedf20d1b51... Signed-off-by: Lee Jones lee@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/mfd/omap-usb-tll.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/mfd/omap-usb-tll.c b/drivers/mfd/omap-usb-tll.c index 446713dbee27a..269eeccb963bc 100644 --- a/drivers/mfd/omap-usb-tll.c +++ b/drivers/mfd/omap-usb-tll.c @@ -246,8 +246,7 @@ static int usbtll_omap_probe(struct platform_device *pdev) break; }
- tll = devm_kzalloc(dev, sizeof(*tll) + sizeof(tll->ch_clk[nch]), - GFP_KERNEL); + tll = devm_kzalloc(dev, struct_size(tll, ch_clk, nch), GFP_KERNEL); if (!tll) { pm_runtime_put_sync(dev); pm_runtime_disable(dev);