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eCryptfs: fix a couple type promotion bugs

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ECRYPTFS_SIZE_AND_MARKER_BYTES is type size_t, so if "rc" is negative
that gets type promoted to a high positive value and treated as success.

Fixes: 778aeb42a7 ("eCryptfs: Cleanup and optimize ecryptfs_lookup_interpose()")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
[tyhicks: Use "if/else if" rather than "if/if"]
Cc: stable@vger.kernel.org
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
This commit is contained in:
Dan Carpenter 2018-07-04 12:35:56 +03:00 committed by Tyler Hicks
parent 5ded587103
commit 0bdf8a8245
1 changed files with 8 additions and 4 deletions
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12
fs/ecryptfs/crypto.c
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@ -1018,8 +1018,10 @@ int ecryptfs_read_and_validate_header_region(struct inode *inode)
rc = ecryptfs_read_lower(file_size, 0, ECRYPTFS_SIZE_AND_MARKER_BYTES,
inode);
if (rc < ECRYPTFS_SIZE_AND_MARKER_BYTES)
return rc >= 0 ? -EINVAL : rc;
if (rc < 0)
return rc;
else if (rc < ECRYPTFS_SIZE_AND_MARKER_BYTES)
return -EINVAL;
rc = ecryptfs_validate_marker(marker);
if (!rc)
ecryptfs_i_size_init(file_size, inode);
@ -1381,8 +1383,10 @@ int ecryptfs_read_and_validate_xattr_region(struct dentry *dentry,
ecryptfs_inode_to_lower(inode),
ECRYPTFS_XATTR_NAME, file_size,
ECRYPTFS_SIZE_AND_MARKER_BYTES);
if (rc < ECRYPTFS_SIZE_AND_MARKER_BYTES)
return rc >= 0 ? -EINVAL : rc;
if (rc < 0)
return rc;
else if (rc < ECRYPTFS_SIZE_AND_MARKER_BYTES)
return -EINVAL;
rc = ecryptfs_validate_marker(marker);
if (!rc)
ecryptfs_i_size_init(file_size, inode);