md/raid10: initialize r10_bio->read_slot before use.

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commit 93decc5636 upstream.

In __make_request() a new r10bio is allocated and passed to
raid10_read_request(). The read_slot member of the bio is not
initialized, and the raid10_read_request() uses it to index an
array. This leads to occasional panics.

Fix by initializing the field to invalid value and checking for
valid value in raid10_read_request().

Cc: stable@vger.kernel.org
Signed-off-by: Kevin Vigor <kvigor@gmail.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Kevin Vigor 2020-11-06 14:20:34 -08:00 • committed by Greg Kroah-Hartman

parent 62162b3223

commit 5ef98378ef

1 changed files with 2 additions and 1 deletions

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drivers/md/raid10.c

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