From: Sven Eckelmann sven@narfation.org
[ Upstream commit 112cedc8e600b668688eb809bf11817adec58ddc ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- fs/debugfs/file.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c index 943637298f65..a32c5c7dcfd8 100644 --- a/fs/debugfs/file.c +++ b/fs/debugfs/file.c @@ -178,8 +178,10 @@ 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? */ @@ -313,8 +315,10 @@ 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? */