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UPSTREAM: lib/stackdepot.c: use flex_array_size() helper in memcpy()

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Make use of the flex_array_size() helper to calculate the size of a
flexible array member within an enclosing structure.

This helper offers defense-in-depth against potential integer overflows,
while at the same time makes it explicitly clear that we are dealing with
a flexible array member.

Link: https://lkml.kernel.org/r/186e37fe07196ee41a0e562fa8a8cb7a01112ec5.1601565471.git.gustavoars@kernel.org
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit 47e684aaa2)
Bug: 172318110
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Change-Id: I47bf75a561c1c0f5df2cba0b2bd883b84dce976f
This commit is contained in:
Gustavo A. R. Silva 2020-12-15 20:43:07 -08:00 committed by Alistair Delva
parent 6251cf847d
commit 522668ec71
1 changed files with 1 additions and 1 deletions
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lib/stackdepot.c
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@ -135,7 +135,7 @@ static struct stack_record *depot_alloc_stack(unsigned long *entries, int size,
stack->handle.slabindex = depot_index;
stack->handle.offset = depot_offset >> STACK_ALLOC_ALIGN;
stack->handle.valid = 1;
memcpy(stack->entries, entries, size * sizeof(unsigned long));
memcpy(stack->entries, entries, flex_array_size(stack, entries, size));
depot_offset += required_size;
return stack;