Messages in this thread Patch in this message | | | From | Boris Brezillon <> | Subject | [PATCH v2] mtd: sa1100: avoid VLA in sa1100_setup_mtd | Date | Mon, 5 Nov 2018 08:58:35 +0100 |
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Enabling -Wvla found another variable-length array with randconfig testing:
drivers/mtd/maps/sa1100-flash.c: In function 'sa1100_setup_mtd': drivers/mtd/maps/sa1100-flash.c:224:10: error: ISO C90 forbids variable length array 'cdev' [-Werror=vla]
Dynamically allocate the cdev array passed to mtd_concat_create() instead of using a VLA.
Reported-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com> Cc: Kees Cook <keescook@chromium.org> Cc: Olof Johansson <olof@lixom.net> --- Changes in v2: - Allocate cdev dynamically instead of having a fixed-size array
Hello,
I'm planning to queue this patch to the mtd/fixes PR. Arnd, Kees, feel free to add your R-b.
Regards,
Boris --- drivers/mtd/maps/sa1100-flash.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/mtd/maps/sa1100-flash.c b/drivers/mtd/maps/sa1100-flash.c index 784c6e1a0391..fd5fe12d7461 100644 --- a/drivers/mtd/maps/sa1100-flash.c +++ b/drivers/mtd/maps/sa1100-flash.c @@ -221,7 +221,14 @@ static struct sa_info *sa1100_setup_mtd(struct platform_device *pdev, info->mtd = info->subdev[0].mtd; ret = 0; } else if (info->num_subdev > 1) { - struct mtd_info *cdev[nr]; + struct mtd_info **cdev; + + cdev = kmalloc_array(nr, sizeof(*cdev), GFP_KERNEL); + if (!cdev) { + ret = -ENOMEM; + goto err; + } + /* * We detected multiple devices. Concatenate them together. */ @@ -230,6 +237,7 @@ static struct sa_info *sa1100_setup_mtd(struct platform_device *pdev, info->mtd = mtd_concat_create(cdev, info->num_subdev, plat->name); + kfree(cdev); if (info->mtd == NULL) { ret = -ENXIO; goto err; -- 2.17.1
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