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| author | Jiri Kosina <jkosina@suse.cz> | 2011-10-26 13:10:39 +1030 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-11-07 12:32:27 -0800 |
| commit | 4d3e486fb80b593cdb04d240b2cadaf8c40dd863 (patch) | |
| tree | 98f681298e616997ed94069b5abb81feae81e5d1 | |
| parent | b628ea1f5cd046c9bd07c5ebef824bae08a85f1c (diff) | |
| download | lwn-4d3e486fb80b593cdb04d240b2cadaf8c40dd863.tar.gz lwn-4d3e486fb80b593cdb04d240b2cadaf8c40dd863.zip | |
kmod: prevent kmod_loop_msg overflow in __request_module()
commit 37252db6aa576c34fd794a5a54fb32d7a8b3a07a upstream.
Due to post-increment in condition of kmod_loop_msg in __request_module(),
the system log can be spammed by much more than 5 instances of the 'runaway
loop' message if the number of events triggering it makes the kmod_loop_msg
to overflow.
Fix that by making sure we never increment it past the threshold.
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | kernel/kmod.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/kmod.c b/kernel/kmod.c index 9fcb53a11f87..d20607840872 100644 --- a/kernel/kmod.c +++ b/kernel/kmod.c @@ -106,10 +106,12 @@ int __request_module(bool wait, const char *fmt, ...) atomic_inc(&kmod_concurrent); if (atomic_read(&kmod_concurrent) > max_modprobes) { /* We may be blaming an innocent here, but unlikely */ - if (kmod_loop_msg++ < 5) + if (kmod_loop_msg < 5) { printk(KERN_ERR "request_module: runaway loop modprobe %s\n", module_name); + kmod_loop_msg++; + } atomic_dec(&kmod_concurrent); return -ENOMEM; } |