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fs/ntfs3: Additional check in ntfs_file_release

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BugLink: https://bugs.launchpad.net/bugs/2099996

[ Upstream commit 031d6f608290c847ba6378322d0986d08d1a645a ]

Reported-by: syzbot+8c652f14a0fde76ff11d@syzkaller.appspotmail.com
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
CVE-2024-50242
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
This commit is contained in:
Konstantin Komarov
2025-02-25 22:59:22 +09:00
committed by Stefan Bader
parent 6c8e4dd1f1
commit 8c99b89d7d
1 changed files with 8 additions and 1 deletions
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fs/ntfs3/file.c
+8 -1
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@@ -1209,7 +1209,14 @@ static int ntfs_file_release(struct inode *inode, struct file *file)
/* If we are last writer on the inode, drop the block reservation. */
if (sbi->options->prealloc &&
((file->f_mode & FMODE_WRITE) &&
atomic_read(&inode->i_writecount) == 1)) {
atomic_read(&inode->i_writecount) == 1)
/*
* The only file when inode->i_fop = &ntfs_file_operations and
* init_rwsem(&ni->file.run_lock) is not called explicitly is MFT.
*
* Add additional check here.
*/
&& inode->i_ino != MFT_REC_MFT) {
ni_lock(ni);
down_write(&ni->file.run_lock);