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ecryptfs: replace BUG_ON with error handling code

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commit 2c2a7552dd upstream.

In crypt_scatterlist, if the crypt_stat argument is not set up
correctly, the kernel crashes. Instead, by returning an error code
upstream, the error is handled safely.

The issue is detected via a static analysis tool written by us.

Fixes: 237fead619 (ecryptfs: fs/Makefile and fs/Kconfig)
Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Signed-off-by: Tyler Hicks <code@tyhicks.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Aditya Pakki 2020-02-14 12:21:01 -06:00 • committed by Greg Kroah-Hartman
commit c0965be4b2
1 changed files with 4 additions and 2 deletions
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6
fs/ecryptfs/crypto.c
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@ -325,8 +325,10 @@ static int crypt_scatterlist(struct ecryptfs_crypt_stat *crypt_stat,
struct extent_crypt_result ecr;
int rc = 0;
BUG_ON(!crypt_stat || !crypt_stat->tfm
|| !(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED));
if (!crypt_stat || !crypt_stat->tfm
|| !(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
return -EINVAL;
if (unlikely(ecryptfs_verbosity > 0)) {
ecryptfs_printk(KERN_DEBUG, "Key size [%zd]; key:\n",
crypt_stat->key_size);