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Hi all,

I found a bug that cause the kernel to lockup.

The problem is in mm/shmem.c do_shmem_file_read() (the tmpfs)

at line 959 there is a call to file_read_actor(desc, page, offset, nr);

The problem is that inside the function file_read_actor() desc->error is
set to -EFAULT (this happens when the buffer supplied by the user for the
read is wrong)
but there is no check right after the return from file_read_actor() to
test this situation.

The result is that the desc->count field always stay the same and the
while loop in do_shmem_file_read never end and the kernel locksup.

The fix is very simple just add the following line after the call to


If you need any other info please mail me



Lior Amar Distributed Computing Lab MOSIX
E-mail :

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