On 2020/3/23 23:10, Jaegeuk Kim wrote: > On 03/23, Joe Perches wrote: >> 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);
Oh, I missed to check that as well. :( > > Thanks, I applied this directly in the f2fs tree. Thanks for the help. Thanks, > . > _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
