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kmod: prevent kmod_loop_msg overflow in __request_module() 

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>
CC: stable@kernel.org
This commit is contained in:
Jiri Kosina 2011-10-26 13:10:39 +10:30 committed by Rusty Russell
parent c3b92c8787
commit 37252db6aa
1 changed files with 3 additions and 1 deletions
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4
kernel/kmod.c
View File

@ -114,10 +114,12 @@ int __request_module(bool wait, const char *fmt, ...)
atomic_inc(&kmod_concurrent); atomic_inc(&kmod_concurrent);
if (atomic_read(&kmod_concurrent) > max_modprobes) { if (atomic_read(&kmod_concurrent) > max_modprobes) {
/* We may be blaming an innocent here, but unlikely */ /* We may be blaming an innocent here, but unlikely */
if (kmod_loop_msg++ < 5) if (kmod_loop_msg < 5) {
printk(KERN_ERR printk(KERN_ERR
"request_module: runaway loop modprobe %s\n", "request_module: runaway loop modprobe %s\n",
module_name); module_name);
kmod_loop_msg++;
}
atomic_dec(&kmod_concurrent); atomic_dec(&kmod_concurrent);
return -ENOMEM; return -ENOMEM;
} }