This is a note to let you know that I've just added the patch titled
staging: vc04_services: shut up out-of-range warning
to my staging git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git in the staging-linus branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.
If you have any questions about this process, please let me know.
From 7ff4034e910fe00a90d985f0d05bacf60c162f02 Mon Sep 17 00:00:00 2001
From: Arnd Bergmann arnd@arndb.de Date: Mon, 27 Sep 2021 13:36:56 +0200 Subject: staging: vc04_services: shut up out-of-range warning
The comparison against SIZE_MAX produces a harmless warning on 64-bit architectures:
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c:185:16: error: result of comparison of constant 419244183493398898 with expression of type 'unsigned int' is always false [-Werror,-Wtautological-constant-out-of-range-compare] if (num_pages > (SIZE_MAX - sizeof(struct pagelist) - ~~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Shut up that warning by adding a cast to a longer type.
Fixes: ca641bae6da9 ("staging: vc04_services: prevent integer overflow in create_pagelist()") Cc: stable stable@vger.kernel.org Signed-off-by: Arnd Bergmann arnd@arndb.de Link: https://lore.kernel.org/r/20210927113702.3866843-1-arnd@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c index b25369a13452..967f10b9582a 100644 --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c @@ -182,7 +182,7 @@ create_pagelist(char *buf, char __user *ubuf, offset = (uintptr_t)ubuf & (PAGE_SIZE - 1); num_pages = DIV_ROUND_UP(count + offset, PAGE_SIZE);
- if (num_pages > (SIZE_MAX - sizeof(struct pagelist) - + if ((size_t)num_pages > (SIZE_MAX - sizeof(struct pagelist) - sizeof(struct vchiq_pagelist_info)) / (sizeof(u32) + sizeof(pages[0]) + sizeof(struct scatterlist)))