Commit a132ff91 authored Apr 12, 2019 by Sebastian Andrzej Siewior Committed by Greg Kroah-Hartman Jan 25, 2024

crypto: scompress - initialize per-CPU variables on each CPU



commit 8c3fffe3993b06dd1955a79bd2f0f3b143d259b3 upstream.

In commit 71052dcf4be70 ("crypto: scompress - Use per-CPU struct instead
multiple variables") I accidentally initialized multiple times the memory on a
random CPU. I should have initialize the memory on every CPU like it has
been done earlier. I didn't notice this because the scheduler didn't
move the task to another CPU.
Guenter managed to do that and the code crashed as expected.

Allocate / free per-CPU memory on each CPU.

Fixes: 71052dcf4be70 ("crypto: scompress - Use per-CPU struct instead multiple variables")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 10d75984

crypto/scompress.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -79,7 +79,7 @@ static void crypto_scomp_free_scratches(void)
		int i;

		for_each_possible_cpu(i) {
		scratch = raw_cpu_ptr(&scomp_scratch);
		scratch = per_cpu_ptr(&scomp_scratch, i);

		vfree(scratch->src);
		vfree(scratch->dst);
		@@ -96,7 +96,7 @@ static int crypto_scomp_alloc_scratches(void)
		for_each_possible_cpu(i) {
		void *mem;

		scratch = raw_cpu_ptr(&scomp_scratch);
		scratch = per_cpu_ptr(&scomp_scratch, i);

		mem = vmalloc_node(SCOMP_SCRATCH_SIZE, cpu_to_node(i));
		if (!mem)