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Code Issues Releases Wiki Activity

eCryptfs: Regression in unencrypted filename symlinks 

The addition of filename encryption caused a regression in unencrypted
filename symlink support.  ecryptfs_copy_filename() is used when dealing
with unencrypted filenames and it reported that the new, copied filename
was a character longer than it should have been.

This caused the return value of readlink() to count the NULL byte of the
symlink target.  Most applications don't care about the extra NULL byte,
but a version control system (bzr) helped in discovering the bug.

Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tyler Hicks 2009-02-06 18:06:51 -06:00 committed by Linus Torvalds
parent eeb94855be
commit fd9fc842bb
1 changed files with 2 additions and 2 deletions
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4
fs/ecryptfs/crypto.c
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@ -1716,7 +1716,7 @@ static int ecryptfs_copy_filename(char **copied_name, size_t *copied_name_size,
{
int rc = 0;
(*copied_name) = kmalloc((name_size + 2), GFP_KERNEL);
(*copied_name) = kmalloc((name_size + 1), GFP_KERNEL);
if (!(*copied_name)) {
rc = -ENOMEM;
goto out;
@ -1726,7 +1726,7 @@ static int ecryptfs_copy_filename(char **copied_name, size_t *copied_name_size,
* in printing out the
* string in debug
* messages */
(*copied_name_size) = (name_size + 1);
(*copied_name_size) = name_size;
out:
return rc;
}