exfat: release s_lock before calling dir_emit()

There is a potential deadlock reported by syzbot as below:

======================================================
WARNING: possible circular locking dependency detected
6.4.0-next-20230707-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor330/5073 is trying to acquire lock:
ffff8880218527a0 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable include/linux/mmap_lock.h:151 [inline]
ffff8880218527a0 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5293 [inline]
ffff8880218527a0 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x369/0x510 mm/memory.c:5344
but task is already holding lock:
ffff888019f760e0 (&sbi->s_lock){+.+.}-{3:3}, at: exfat_iterate+0x117/0xb50 fs/exfat/dir.c:232

which lock already depends on the new lock.

Chain exists of:
  &mm->mmap_lock --> mapping.invalidate_lock#3 --> &sbi->s_lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&sbi->s_lock);
                               lock(mapping.invalidate_lock#3);
                               lock(&sbi->s_lock);
  rlock(&mm->mmap_lock);

Let's try to avoid above potential deadlock condition by moving dir_emit*()
out of sbi->s_lock coverage.

Fixes: ca06197382bd ("exfat: add directory operations")
Cc: stable@vger.kernel.org #v5.7+
Reported-by: syzbot+1741a5d9b79989c10bdc@syzkaller.appspotmail.com
Link: https://lore.kernel.org/lkml/00000000000078ee7e060066270b@google.com/T/#u
Tested-by: syzbot+1741a5d9b79989c10bdc@syzkaller.appspotmail.com
Signed-off-by: Sungjong Seo <sj1557.seo@samsung.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>

diff --git a/fs/exfat/dir.c b/fs/exfat/dir.c
index bc48f33..598081d 100644 (file)
--- a/fs/exfat/dir.c
+++ b/fs/exfat/dir.c
@@ -218,7 +218,10 @@ static void exfat_free_namebuf(struct exfat_dentry_namebuf *nb)
        exfat_init_namebuf(nb);
 }
 
-/* skip iterating emit_dots when dir is empty */
+/*
+ * Before calling dir_emit*(), sbi->s_lock should be released
+ * because page fault can occur in dir_emit*().
+ */
 #define ITER_POS_FILLED_DOTS    (2)
 static int exfat_iterate(struct file *file, struct dir_context *ctx)
 {
@@ -233,11 +236,10 @@ static int exfat_iterate(struct file *file, struct dir_context *ctx)
        int err = 0, fake_offset = 0;
 
        exfat_init_namebuf(nb);
-       mutex_lock(&EXFAT_SB(sb)->s_lock);
 
        cpos = ctx->pos;
        if (!dir_emit_dots(file, ctx))
-               goto unlock;
+               goto out;
 
        if (ctx->pos == ITER_POS_FILLED_DOTS) {
                cpos = 0;
@@ -249,16 +251,18 @@ static int exfat_iterate(struct file *file, struct dir_context *ctx)
        /* name buffer should be allocated before use */
        err = exfat_alloc_namebuf(nb);
        if (err)
-               goto unlock;
+               goto out;
 get_new:
+       mutex_lock(&EXFAT_SB(sb)->s_lock);
+
        if (ei->flags == ALLOC_NO_FAT_CHAIN && cpos >= i_size_read(inode))
                goto end_of_dir;
 
        err = exfat_readdir(inode, &cpos, &de);
        if (err) {
                /*
-                * At least we tried to read a sector.  Move cpos to next sector
-                * position (should be aligned).
+                * At least we tried to read a sector.
+                * Move cpos to next sector position (should be aligned).
                 */
                if (err == -EIO) {
                        cpos += 1 << (sb->s_blocksize_bits);
@@ -281,16 +285,10 @@ get_new:
                inum = iunique(sb, EXFAT_ROOT_INO);
        }
 
-       /*
-        * Before calling dir_emit(), sb_lock should be released.
-        * Because page fault can occur in dir_emit() when the size
-        * of buffer given from user is larger than one page size.
-        */
        mutex_unlock(&EXFAT_SB(sb)->s_lock);
        if (!dir_emit(ctx, nb->lfn, strlen(nb->lfn), inum,
                        (de.attr & ATTR_SUBDIR) ? DT_DIR : DT_REG))
-               goto out_unlocked;
-       mutex_lock(&EXFAT_SB(sb)->s_lock);
+               goto out;
        ctx->pos = cpos;
        goto get_new;
 
@@ -298,9 +296,8 @@ end_of_dir:
        if (!cpos && fake_offset)
                cpos = ITER_POS_FILLED_DOTS;
        ctx->pos = cpos;
-unlock:
        mutex_unlock(&EXFAT_SB(sb)->s_lock);
-out_unlocked:
+out:
        /*
         * To improve performance, free namebuf after unlock sb_lock.
         * If namebuf is not allocated, this function do nothing