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author | Tom Rix <trix@redhat.com> | 2021-04-19 10:37:14 +0300 |
---|---|---|
committer | Jens Axboe <axboe@kernel.dk> | 2021-04-20 17:59:04 +0300 |
commit | ce9d2b4f7bbeec818766f1e809816ba37b9aa4fa (patch) | |
tree | 5fb8b3864ef04b12755bea8fef620f5c5594948d | |
parent | c77bfa8f5dbd3f8bbb99a751bab00ebcc229a5c5 (diff) | |
download | linux-ce9d2b4f7bbeec818766f1e809816ba37b9aa4fa.tar.xz |
block/rnbd-clt: Improve find_or_create_sess() return check
clang static analysis reports this problem
rnbd-clt.c:1212:11: warning: Branch condition evaluates to a
garbage value
else if (!first)
^~~~~~
This is triggered in the find_and_get_or_create_sess() call
because the variable first is not initialized and the
earlier check is specifically for
if (sess == ERR_PTR(-ENOMEM))
This is false positive.
But the if-check can be reduced by initializing first to
false and then returning if the call to find_or_creat_sess()
does not set it to true. When it remains false, either
sess will be valid or not. The not case is caught by
find_and_get_or_create_sess()'s caller rnbd_clt_map_device()
sess = find_and_get_or_create_sess(...);
if (IS_ERR(sess))
return ERR_CAST(sess);
Since find_and_get_or_create_sess() initializes first to false
setting it in find_or_create_sess() is not needed.
Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Gioh Kim <gi-oh.kim@ionos.com>
Link: https://lore.kernel.org/r/20210419073722.15351-12-gi-oh.kim@ionos.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r-- | drivers/block/rnbd/rnbd-clt.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/drivers/block/rnbd/rnbd-clt.c b/drivers/block/rnbd/rnbd-clt.c index 652b41cc4492..9b44aac680d5 100644 --- a/drivers/block/rnbd/rnbd-clt.c +++ b/drivers/block/rnbd/rnbd-clt.c @@ -910,6 +910,7 @@ again: return NULL; } +/* caller is responsible for initializing 'first' to false */ static struct rnbd_clt_session *find_or_create_sess(const char *sessname, bool *first) { @@ -925,8 +926,7 @@ rnbd_clt_session *find_or_create_sess(const char *sessname, bool *first) } list_add(&sess->list, &sess_list); *first = true; - } else - *first = false; + } mutex_unlock(&sess_lock); return sess; @@ -1194,13 +1194,11 @@ find_and_get_or_create_sess(const char *sessname, struct rnbd_clt_session *sess; struct rtrs_attrs attrs; int err; - bool first; + bool first = false; struct rtrs_clt_ops rtrs_ops; sess = find_or_create_sess(sessname, &first); - if (sess == ERR_PTR(-ENOMEM)) - return ERR_PTR(-ENOMEM); - else if (!first) + if (!first) return sess; if (!path_cnt) { |