5.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ilya Krutskih commit 73c37fe54cd056d07461b142ab0b8b81e1ef6ad8 upstream. Reserve space for the termination NUL after the maximum 20 decimal digits of a long long value to avoid buffer overflow in sprintf(). Fixes: f5db4af466e2 ("dm raid1: add userspace log") Cc: stable@vger.kernel.org Signed-off-by: Ilya Krutskih Signed-off-by: Mikulas Patocka Signed-off-by: Greg Kroah-Hartman --- drivers/md/dm-log-userspace-base.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/md/dm-log-userspace-base.c +++ b/drivers/md/dm-log-userspace-base.c @@ -138,6 +138,7 @@ static int build_constructor_string(stru str_size += strlen(argv[i]) + 1; /* +1 for space between args */ str_size += 20; /* Max number of chars in a printed u64 number */ + str_size++; /* For NUL-terminator */ str = kzalloc(str_size, GFP_KERNEL); if (!str) {