[S] Change in coreboot[main]: drivers/efi/capsules.c: check for overflows of capsule sizes

[Sergii Dmytruk (Code Review)]

Attention is currently required from: Nico Huber, Sergii Dmytruk.

Hello Nico Huber, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/84541?usp=email

to look at the new patch set (#2).

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Code-Review+2 by Nico Huber, Verified+1 by build bot (Jenkins)

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Change subject: drivers/efi/capsules.c: check for overflows of capsule sizes
......................................................................

drivers/efi/capsules.c: check for overflows of capsule sizes

As was pointed out in comments on CB:83422, the code lacks overflow
checks:
 - when computing size of capsules in a single capsule block
 - when computing size of capsules in all capsule blocks

If an overflow is triggered, the code might allocate a capsule buffer
smaller than the data that's going to be written to it leading to
overwriting memory after the buffer.

Change-Id: I43d17d77197fc2cbd721d47941101551603c352a
Signed-off-by: Sergii Dmytruk 
---
M src/drivers/efi/capsules.c
1 file changed, 20 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/41/84541/2