3.16.76-rc1 review patch. If anyone has any objections, please let me know.
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From: Dan Carpenter dan.carpenter@oracle.com
commit 0bdf8a8245fdea6f075a5fede833a5fcf1b3466c upstream.
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: 778aeb42a708 ("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"] Signed-off-by: Tyler Hicks tyhicks@canonical.com Signed-off-by: Ben Hutchings ben@decadent.org.uk --- fs/ecryptfs/crypto.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-)
--- a/fs/ecryptfs/crypto.c +++ b/fs/ecryptfs/crypto.c @@ -1042,8 +1042,10 @@ int ecryptfs_read_and_validate_header_re
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); @@ -1401,8 +1403,10 @@ int ecryptfs_read_and_validate_xattr_reg rc = ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), 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);