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hw/misc/aspeed_hace: Fix buffer overflow in has_padding function

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The maximum padding size is either 64 or 128 bytes and should always be smaller
than "req_len". If "padding_size" exceeds "req_len", then
"req_len - padding_size" underflows due to "uint32_t" data type, leading to a
large incorrect value (e.g., `0xFFXXXXXX`). This causes an out-of-bounds memory
access, potentially leading to a buffer overflow.

Added a check to ensure "padding_size" does not exceed "req_len" before
computing "pad_offset". This prevents "req_len - padding_size" from underflowing
and avoids accessing invalid memory.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Fixes: 5cd7d8564a8b563da724b9e6264c967f0a091afa ("aspeed/hace: Support AST2600 HACE ")
Link: https://lore.kernel.org/qemu-devel/20250321092623.2097234-3-jamin_lin@aspeedtech.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Jamin Lin 2025-03-21 17:25:58 +08:00 committed by Cédric Le Goater
parent 7b8cbe5162
commit 78877b2e06
1 changed files with 5 additions and 0 deletions
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5
hw/misc/aspeed_hace.c
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@ -128,6 +128,11 @@ static bool has_padding(AspeedHACEState *s, struct iovec *iov,
if (*total_msg_len <= s->total_req_len) {
uint32_t padding_size = s->total_req_len - *total_msg_len;
uint8_t *padding = iov->iov_base;
if (padding_size > req_len) {
return false;
}
*pad_offset = req_len - padding_size;
if (padding[*pad_offset] == 0x80) {
return true;