cifs: don't dereference smb_file_target before null check

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[ Upstream commit 8c6c9bed87 ]

There is a null check on dst_file->private data which suggests
it can be potentially null. However, before this check, pointer
smb_file_target is derived from dst_file->private and dereferenced
in the call to tlink_tcon, hence there is a potential null pointer
deference.

Fix this by assigning smb_file_target and target_tcon after the
null pointer sanity checks.

Detected by CoverityScan, CID#1475302 ("Dereference before null check")

Fixes: 04b38d6012 ("vfs: pull btrfs clone API to vfs layer")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Colin Ian King 2018-11-01 13:14:30 +00:00 • committed by Greg Kroah-Hartman

parent 1beb22c524

commit ad1834fd8a

1 changed files with 5 additions and 2 deletions

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fs/cifs/cifsfs.c

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