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util/ifittool: Fix buffer overflow with padded microcode patches 

Some microcode patches are padded with zeros, which make
parse_microcode_blob() read beyond the end of the buffer.

BRANCH=firmware-brya-14505.B
BUG=b:245380705
TEST=No segmentation fault with a padded microcode patch

Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com>
Change-Id: Id9c5fb6c1e264f3f5137d29201b9021c72d78fdd
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67460
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Cliff Huang <cliff.huang@intel.com>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
This commit is contained in:
Jeremy Compostella 2022-09-08 13:47:35 -07:00 committed by Felix Held
parent f4a8a92cc2
commit 46ffccd753
1 changed files with 2 additions and 1 deletions
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3
util/cbfstool/fit.c
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@ -297,7 +297,8 @@ parse_microcode_blob(struct cbfs_image *image,
uint32_t total_size = mcu_header->total_size ?: 2048;
/* Quickly sanity check a prospective microcode update. */
if (total_size < sizeof(*mcu_header))
if (total_size < sizeof(*mcu_header) ||
total_size > file_length)
break;
/* FIXME: Should the checksum be validated? */