Re: [PATCH] dm: fix a crash if blk_alloc_disk fails

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On 07/10/24 01:38PM, Mikulas Patocka wrote:

Hi

Here I'm submitting a patch for this bug.

Mikulas


From: Mikulas Patocka <mpatocka@xxxxxxxxxx>

If blk_alloc_disk fails, the variable md->disk is set to an error value.
cleanup_mapped_device will see that md->disk is non-NULL and it will
attempt to access it, causing a crash on this statement
"md->disk->private_data = NULL;".

Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Reported-by: Chenyuan Yang <chenyuan0y@xxxxxxxxx>
Closes: https://marc.info/?l=dm-devel&m=172824125004329&w=2
Cc: stable@xxxxxxxxxxxxxxx

Reviewed-by: Nitesh Shetty <nj.shetty@xxxxxxxxxxx>





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