This is a note to let you know that I've just added the patch titled lightnvm: fix out-of-bounds write to array devices->info[] to the 5.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: lightnvm-fix-out-of-bounds-write-to-array-devices-in.patch and it can be found in the queue-5.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 2a9763de49d29a1460088fc3250163406a4d0b42 Author: Colin Ian King <colin.king@xxxxxxxxxxxxx> Date: Fri Oct 16 15:33:51 2020 +0100 lightnvm: fix out-of-bounds write to array devices->info[] [ Upstream commit a48faebe65b0db55a73b9220c3d919eee849bb79 ] There is an off-by-one array check that can lead to a out-of-bounds write to devices->info[i]. Fix this by checking by using >= rather than > for the size check. Also replace hard-coded array size limit with ARRAY_SIZE on the array. Addresses-Coverity: ("Out-of-bounds write") Fixes: cd9e9808d18f ("lightnvm: Support for Open-Channel SSDs") Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx> Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c index fe78bf0fdce54..c1bcac71008c6 100644 --- a/drivers/lightnvm/core.c +++ b/drivers/lightnvm/core.c @@ -1311,8 +1311,9 @@ static long nvm_ioctl_get_devices(struct file *file, void __user *arg) strlcpy(info->bmname, "gennvm", sizeof(info->bmname)); i++; - if (i > 31) { - pr_err("max 31 devices can be reported.\n"); + if (i >= ARRAY_SIZE(devices->info)) { + pr_err("max %zd devices can be reported.\n", + ARRAY_SIZE(devices->info)); break; } }