On Mon, 2020-03-23 at 11:18 +0800, Chao Yu wrote:
> f2fs_inode_info.flags is unsigned long variable, it has 32 bits
> in 32bit architecture, since we introduced FI_MMAP_FILE flag
> when we support data compression, we may access memory cross
> the border of .flags field, corrupting .i_sem field, result in
> below deadlock.
[]
> diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
[]
> @@ -362,7 +362,7 @@ static int do_read_inode(struct inode *inode)
> fi->i_flags = le32_to_cpu(ri->i_flags);
> if (S_ISREG(inode->i_mode))
> fi->i_flags &= ~F2FS_PROJINHERIT_FL;
> - fi->flags = 0;
> + bitmap_zero(fi->flags, BITS_TO_LONGS(FI_MAX));
Sorry, I misled you here, this should be
bitmap_zero(fi->flags, FI_MAX);
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