In ppp_generic.c, memdup_user() is utilized to copy a userspace array. This is done without an overflow-check, which is, however, not critical because the multiplicands are an unsigned short and struct sock_filter, which is currently of size 8. Regardless, string.h now provides memdup_array_user(), a wrapper for copying userspace arrays in a standardized manner, which has the advantage of making it more obvious to the reader that an array is being copied. The wrapper additionally performs an obligatory overflow check, saving the reader the effort of analyzing the potential for overflow, and making the code a bit more robust in case of future changes to the multiplicands len * size. Replace memdup_user() with memdup_array_user(). Suggested-by: Dave Airlie <airlied@xxxxxxxxxx> Signed-off-by: Philipp Stanner <pstanner@xxxxxxxxxx> --- Changes in v2: - Rename the commit and rephrase its message completely so that it becomes a) obvious that we're not fixing an actual overflow here and b) emphasize that the goal is increasing readability. (Al Viro) --- drivers/net/ppp/ppp_generic.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/ppp/ppp_generic.c b/drivers/net/ppp/ppp_generic.c index a9beacd552cf..0193af2d31c9 100644 --- a/drivers/net/ppp/ppp_generic.c +++ b/drivers/net/ppp/ppp_generic.c @@ -570,8 +570,8 @@ static struct bpf_prog *get_filter(struct sock_fprog *uprog) /* uprog->len is unsigned short, so no overflow here */ fprog.len = uprog->len; - fprog.filter = memdup_user(uprog->filter, - uprog->len * sizeof(struct sock_filter)); + fprog.filter = memdup_array_user(uprog->filter, + uprog->len, sizeof(struct sock_filter)); if (IS_ERR(fprog.filter)) return ERR_CAST(fprog.filter); -- 2.41.0
