From: Colin Ian King colin.king@canonical.com
[ 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@canonical.com Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/lightnvm/core.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c index db38a68abb6c0..a6f4ca438bca1 100644 --- a/drivers/lightnvm/core.c +++ b/drivers/lightnvm/core.c @@ -1315,8 +1315,9 @@ 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; } }