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authorJiri Kosina <jkosina@suse.cz>2011-10-26 13:10:39 +1030
committerGreg Kroah-Hartman <gregkh@suse.de>2011-11-11 09:35:48 -0800
commit3cdf240310b4f3d94981d727d3660c78a50a40c6 (patch)
treefae7019c027ef93773110db514fa39f63cff46f5 /kernel
parent50f621d8f5b6f9e8ed931df12c595fd0e882f8e3 (diff)
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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/kmod.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/kmod.c b/kernel/kmod.c
index 47613dfb7b28..fabfe541b1d4 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -114,10 +114,12 @@ 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;
}