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| author | David Teigland <teigland@redhat.com> | 2013-02-04 15:31:22 -0600 |
|---|---|---|
| committer | David Teigland <teigland@redhat.com> | 2013-02-04 15:31:22 -0600 |
| commit | d4b0bcf32b946590afd29e202d6a399b84fe6c67 (patch) | |
| tree | ab44da9a693c1e7fd22e5f45d26e1e7742281516 | |
| parent | 6edacf05c8362f4c368991b55d85e8122cfc9a24 (diff) | |
| download | linux-d4b0bcf32b946590afd29e202d6a399b84fe6c67.tar.gz linux-d4b0bcf32b946590afd29e202d6a399b84fe6c67.tar.bz2 linux-d4b0bcf32b946590afd29e202d6a399b84fe6c67.zip | |
dlm: check the write size from user
Return EINVAL from write if the size is larger than
allowed. Do this before allocating kernel memory for
the bogus size, which could lead to OOM.
Reported-by: Sasha Levin <levinsasha928@gmail.com>
Tested-by: Jana Saout <jana@saout.de>
Signed-off-by: David Teigland <teigland@redhat.com>
| -rw-r--r-- | fs/dlm/user.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/dlm/user.c b/fs/dlm/user.c index 7ff49852b0cb..911649a47dd5 100644 --- a/fs/dlm/user.c +++ b/fs/dlm/user.c @@ -503,11 +503,11 @@ static ssize_t device_write(struct file *file, const char __user *buf, #endif return -EINVAL; -#ifdef CONFIG_COMPAT - if (count > sizeof(struct dlm_write_request32) + DLM_RESNAME_MAXLEN) -#else + /* + * can't compare against COMPAT/dlm_write_request32 because + * we don't yet know if is64bit is zero + */ if (count > sizeof(struct dlm_write_request) + DLM_RESNAME_MAXLEN) -#endif return -EINVAL; kbuf = kzalloc(count + 1, GFP_NOFS); |