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authorYi Yang <yiyang13@huawei.com>2022-05-10 16:05:33 +0800
committerMax Filippov <jcmvbkbc@gmail.com>2022-05-11 02:15:38 -0700
commitb011946d039d66bbc7102137e98cc67e1356aa87 (patch)
tree187e0f9ca53b97149bc795bf9945320ade1b1572 /security
parentc6ab42b31fce42c4b7f775752d91db0f2b71c65e (diff)
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xtensa/simdisk: fix proc_read_simdisk()
The commit a69755b18774 ("xtensa simdisk: switch to proc_create_data()") split read operation into two parts, first retrieving the path when it's non-null and second retrieving the trailing '\n'. However when the path is non-null the first simple_read_from_buffer updates ppos, and the second simple_read_from_buffer returns 0 if ppos is greater than 1 (i.e. almost always). As a result reading from that proc file is almost always empty. Fix it by making a temporary copy of the path with the trailing '\n' and using simple_read_from_buffer on that copy. Cc: stable@vger.kernel.org Fixes: a69755b18774 ("xtensa simdisk: switch to proc_create_data()") Signed-off-by: Yi Yang <yiyang13@huawei.com> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
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