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authorAlexei Starovoitov <ast@plumgrid.com>2014-11-13 17:36:47 -0800
committerDavid S. Miller <davem@davemloft.net>2014-11-18 13:43:59 -0500
commita1854d6ac0008518bfc45e791172ad250999c2a2 (patch)
tree20a92b168b05e32b66e0e21007e406a925acb84b /kernel/bpf/syscall.c
parent28fbcfa08d8ed7c5a50d41a0433aad222835e8e3 (diff)
downloadlinux-sh-a1854d6ac0008518bfc45e791172ad250999c2a2.tar.gz
bpf: fix BPF_MAP_LOOKUP_ELEM command return code
fix errno of BPF_MAP_LOOKUP_ELEM command as bpf manpage described it in commit b4fc1a460f30("Merge branch 'bpf-next'"): ----- BPF_MAP_LOOKUP_ELEM int bpf_lookup_elem(int fd, void *key, void *value) { union bpf_attr attr = { .map_fd = fd, .key = ptr_to_u64(key), .value = ptr_to_u64(value), }; return bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)); } bpf() syscall looks up an element with given key in a map fd. If element is found it returns zero and stores element's value into value. If element is not found it returns -1 and sets errno to ENOENT. and further down in manpage: ENOENT For BPF_MAP_LOOKUP_ELEM or BPF_MAP_DELETE_ELEM, indicates that element with given key was not found. ----- In general all BPF commands return ENOENT when map element is not found (including BPF_MAP_GET_NEXT_KEY and BPF_MAP_UPDATE_ELEM with flags == BPF_MAP_UPDATE_ONLY) Subsequent patch adds a testsuite to check return values for all of these combinations. Signed-off-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel/bpf/syscall.c')
-rw-r--r--kernel/bpf/syscall.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index c0d03bf317a2..088ac0b1b106 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -169,7 +169,7 @@ static int map_lookup_elem(union bpf_attr *attr)
if (copy_from_user(key, ukey, map->key_size) != 0)
goto free_key;
- err = -ESRCH;
+ err = -ENOENT;
rcu_read_lock();
value = map->ops->map_lookup_elem(map, key);
if (!value)