From: Daniel Borkmann Date: Thu, 3 Nov 2016 23:56:31 +0000 (+0100) Subject: bpf: fix map not being uncharged during map creation failure X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=20b2b24f91f70e7d3f0918c077546cb21bd73a87;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git bpf: fix map not being uncharged during map creation failure In map_create(), we first find and create the map, then once that suceeded, we charge it to the user's RLIMIT_MEMLOCK, and then fetch a new anon fd through anon_inode_getfd(). The problem is, once the latter fails f.e. due to RLIMIT_NOFILE limit, then we only destruct the map via map->ops->map_free(), but without uncharging the previously locked memory first. That means that the user_struct allocation is leaked as well as the accounted RLIMIT_MEMLOCK memory not released. Make the label names in the fix consistent with bpf_prog_load(). Fixes: aaac3ba95e4c ("bpf: charge user for creation of BPF maps and programs") Signed-off-by: Daniel Borkmann Acked-by: Alexei Starovoitov Signed-off-by: David S. Miller --- diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 228f962447a5..237f3d6a7ddc 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -194,7 +194,7 @@ static int map_create(union bpf_attr *attr) err = bpf_map_charge_memlock(map); if (err) - goto free_map; + goto free_map_nouncharge; err = bpf_map_new_fd(map); if (err < 0) @@ -204,6 +204,8 @@ static int map_create(union bpf_attr *attr) return err; free_map: + bpf_map_uncharge_memlock(map); +free_map_nouncharge: map->ops->map_free(map); return err; }