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authorSven Eckelmann <sven@narfation.org>2021-08-02 18:24:44 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-08-05 14:42:40 +0200
commit112cedc8e600b668688eb809bf11817adec58ddc (patch)
treebc04589a1fc33416a3d8ecab7e5925b26e764be0 /fs/debugfs
parentfac58b4a5287c9d37c39d09d9bdc80846b744649 (diff)
debugfs: Return error during {full/open}_proxy_open() on rmmod
If a kernel module gets unloaded then it printed report about a leak before commit 275678e7a9be ("debugfs: Check module state before warning in {full/open}_proxy_open()"). An additional check was added in this commit to avoid this printing. But it was forgotten that the function must return an error in this case because it was not actually opened. As result, the systems started to crash or to hang when a module was unloaded while something was trying to open a file. Fixes: 275678e7a9be ("debugfs: Check module state before warning in {full/open}_proxy_open()") Cc: Taehee Yoo <ap420073@gmail.com> Reported-by: Mário Lopes <ml@simonwunderlich.de> Signed-off-by: Sven Eckelmann <sven@narfation.org> Link: https://lore.kernel.org/r/20210802162444.7848-1-sven@narfation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/debugfs')
-rw-r--r--fs/debugfs/file.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index df00231d3ecc..7d162b0efbf0 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -179,8 +179,10 @@ static int open_proxy_open(struct inode *inode, struct file *filp)
if (!fops_get(real_fops)) {
#ifdef CONFIG_MODULES
if (real_fops->owner &&
- real_fops->owner->state == MODULE_STATE_GOING)
+ real_fops->owner->state == MODULE_STATE_GOING) {
+ r = -ENXIO;
goto out;
+ }
#endif
/* Huh? Module did not clean up after itself at exit? */
@@ -314,8 +316,10 @@ static int full_proxy_open(struct inode *inode, struct file *filp)
if (!fops_get(real_fops)) {
#ifdef CONFIG_MODULES
if (real_fops->owner &&
- real_fops->owner->state == MODULE_STATE_GOING)
+ real_fops->owner->state == MODULE_STATE_GOING) {
+ r = -ENXIO;
goto out;
+ }
#endif
/* Huh? Module did not cleanup after itself at exit? */