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lib/test_meminit.c: use GFP_ATOMIC in RCU critical section 

kmalloc() shouldn't sleep while in RCU critical section, therefore use
GFP_ATOMIC instead of GFP_KERNEL.

The bug was spotted by the 0day kernel testing robot.

Link: http://lkml.kernel.org/r/20190725121703.210874-1-glider@google.com
Fixes: 7e659650cbda ("lib: introduce test_meminit module")
Signed-off-by: Alexander Potapenko <glider@google.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Reported-by: kernel test robot <lkp@intel.com>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexander Potapenko 2019-08-02 21:49:22 -07:00 committed by Linus Torvalds
parent cbedfe1134
commit 733d1d1a77
1 changed files with 1 additions and 1 deletions
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2
lib/test_meminit.c
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@ -222,7 +222,7 @@ static int __init do_kmem_cache_size(size_t size, bool want_ctor,
* Copy the buffer to check that it's not wiped on * Copy the buffer to check that it's not wiped on
* free(). * free().
*/ */
buf_copy = kmalloc(size, GFP_KERNEL); buf_copy = kmalloc(size, GFP_ATOMIC);
if (buf_copy) if (buf_copy)
memcpy(buf_copy, buf, size); memcpy(buf_copy, buf, size);