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authorLu Fengqi <lufq.fnst@cn.fujitsu.com>2018-06-19 09:54:38 +0300
committerDavid Sterba <dsterba@suse.com>2018-06-21 20:21:13 +0300
commit22883ddc66df402f2fbc37fe1f4d2779238e4b2d (patch)
treed0f75b3ecc879da62260f4c7d6b3aa1372595156 /fs/btrfs
parentf098631848cd9f4142b6dec7ea95baad846e1670 (diff)
downloadlinux-22883ddc66df402f2fbc37fe1f4d2779238e4b2d.tar.xz
btrfs: fix invalid-free in btrfs_extent_same
If this condition ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != (BTRFS_I(dst)->flags & BTRFS_INODE_NODATASUM)) is hit, we will go to free the uninitialized cmp.src_pages and cmp.dst_pages. Fixes: 67b07bd4bec5 ("Btrfs: reuse cmp workspace in EXTENT_SAME ioctl") Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/ioctl.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 5556e9ea2a4b..a4d2856a4df1 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3577,7 +3577,7 @@ static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,
ret = btrfs_extent_same_range(src, loff, BTRFS_MAX_DEDUPE_LEN,
dst, dst_loff, &cmp);
if (ret)
- goto out_unlock;
+ goto out_free;
loff += BTRFS_MAX_DEDUPE_LEN;
dst_loff += BTRFS_MAX_DEDUPE_LEN;
@@ -3587,16 +3587,16 @@ static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,
ret = btrfs_extent_same_range(src, loff, tail_len, dst,
dst_loff, &cmp);
+out_free:
+ kvfree(cmp.src_pages);
+ kvfree(cmp.dst_pages);
+
out_unlock:
if (same_inode)
inode_unlock(src);
else
btrfs_double_inode_unlock(src, dst);
-out_free:
- kvfree(cmp.src_pages);
- kvfree(cmp.dst_pages);
-
return ret;
}