diff options
authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-04-05 11:48:52 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-04-10 11:09:41 +0200
commitb4104180a2efb85f55e1ba1407885c9421970338 (patch)
parent312723a0b34d6d110aa4427a982536bb36ab8471 (diff)
kobject_uevent: remove warning in init_uevent_argv()
syzbot can trigger the WARN() in init_uevent_argv() which isn't the nicest as the code does properly recover and handle the error. So change the WARN() call to pr_warn() and provide some more information on what the buffer size that was needed. Link: https://lore.kernel.org/r/20201107082206.GA19079@kroah.com Cc: "Rafael J. Wysocki" <rafael@kernel.org> Cc: linux-kernel@vger.kernel.org Reported-by: syzbot+92340f7b2b4789907fdb@syzkaller.appspotmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Link: https://lore.kernel.org/r/20210405094852.1348499-1-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 files changed, 5 insertions, 4 deletions
diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index 7998affa45d4..c87d5b6a8a55 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -251,12 +251,13 @@ static int kobj_usermode_filter(struct kobject *kobj)
static int init_uevent_argv(struct kobj_uevent_env *env, const char *subsystem)
+ int buffer_size = sizeof(env->buf) - env->buflen;
int len;
- len = strlcpy(&env->buf[env->buflen], subsystem,
- sizeof(env->buf) - env->buflen);
- if (len >= (sizeof(env->buf) - env->buflen)) {
- WARN(1, KERN_ERR "init_uevent_argv: buffer size too small\n");
+ len = strlcpy(&env->buf[env->buflen], subsystem, buffer_size);
+ if (len >= buffer_size) {
+ pr_warn("init_uevent_argv: buffer size of %d too small, needed %d\n",
+ buffer_size, len);
return -ENOMEM;