6.15-stable review patch. If anyone has any objections, please let me know.
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From: Konstantin Komarov almaz.alexandrovich@paragon-software.com
[ Upstream commit a49f0abd8959048af18c6c690b065eb0d65b2d21 ]
This reverts commit 69505fe98f198ee813898cbcaf6770949636430b.
Initially, conditional lock acquisition was removed to fix an xfstest bug that was observed during internal testing. The deadlock reported by syzbot is resolved by reintroducing conditional acquisition. The xfstest bug no longer occurs on kernel version 6.16-rc1 during internal testing. I assume that changes in other modules may have contributed to this.
Fixes: 69505fe98f19 ("fs/ntfs3: Replace inode_trylock with inode_lock") Reported-by: syzbot+a91fcdbd2698f99db8f4@syzkaller.appspotmail.com Suggested-by: Lorenzo Stoakes lorenzo.stoakes@oracle.com Signed-off-by: Konstantin Komarov almaz.alexandrovich@paragon-software.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/ntfs3/file.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c index 9b6a3f8d2e7c..fbecda79fa84 100644 --- a/fs/ntfs3/file.c +++ b/fs/ntfs3/file.c @@ -394,7 +394,10 @@ static int ntfs_file_mmap(struct file *file, struct vm_area_struct *vma) }
if (ni->i_valid < to) { - inode_lock(inode); + if (!inode_trylock(inode)) { + err = -EAGAIN; + goto out; + } err = ntfs_extend_initialized_size(file, ni, ni->i_valid, to); inode_unlock(inode);