AcoSail/kernel_optimize_test
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dlm: check the write size from user

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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>
This commit is contained in:
David Teigland 2013-02-04 15:31:22 -06:00
parent 6edacf05c8
commit d4b0bcf32b
1 changed files with 4 additions and 4 deletions
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8
fs/dlm/user.c
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@ -503,11 +503,11 @@ static ssize_t device_write(struct file *file, const char __user *buf,
#endif #endif
return -EINVAL; return -EINVAL;
#ifdef CONFIG_COMPAT /*
if (count > sizeof(struct dlm_write_request32) + DLM_RESNAME_MAXLEN) * can't compare against COMPAT/dlm_write_request32 because
#else * we don't yet know if is64bit is zero
*/
if (count > sizeof(struct dlm_write_request) + DLM_RESNAME_MAXLEN) if (count > sizeof(struct dlm_write_request) + DLM_RESNAME_MAXLEN)
#endif
return -EINVAL; return -EINVAL;
kbuf = kzalloc(count + 1, GFP_NOFS); kbuf = kzalloc(count + 1, GFP_NOFS);