blob: 391ee2e149f48def6c46223acc0b9fe33dff8fd0 [file] [log] [blame]
From cff89b190444a12b0af2c7046a9c8eeac1d7560a Mon Sep 17 00:00:00 2001
From: Sasha Levin <sashal@kernel.org>
Date: Fri, 5 Feb 2021 16:11:00 -0600
Subject: net: ipa: avoid field overflow
From: Alex Elder <elder@linaro.org>
[ Upstream commit cd1150098f2cc7bd05740c105488c293f6761f5a ]
It's possible that the length passed to ipa_header_size_encoded()
is larger than what can be represented by the HDR_LEN field alone
(starting with IPA v4.5). If we attempted that, u32_encode_bits()
would trigger a build-time error.
Avoid this problem by masking off high-order bits of the value
encoded as the lower portion of the header length.
The same sort of problem exists in ipa_metadata_offset_encoded(),
so implement the same fix there.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ipa/ipa_reg.h | 22 ++++++++++++++--------
1 file changed, 14 insertions(+), 8 deletions(-)
diff --git a/drivers/net/ipa/ipa_reg.h b/drivers/net/ipa/ipa_reg.h
index e6b0827a244e..732e691e9aa6 100644
--- a/drivers/net/ipa/ipa_reg.h
+++ b/drivers/net/ipa/ipa_reg.h
@@ -408,15 +408,18 @@ enum ipa_cs_offload_en {
static inline u32 ipa_header_size_encoded(enum ipa_version version,
u32 header_size)
{
+ u32 size = header_size & field_mask(HDR_LEN_FMASK);
u32 val;
- val = u32_encode_bits(header_size, HDR_LEN_FMASK);
- if (version < IPA_VERSION_4_5)
+ val = u32_encode_bits(size, HDR_LEN_FMASK);
+ if (version < IPA_VERSION_4_5) {
+ /* ipa_assert(header_size == size); */
return val;
+ }
/* IPA v4.5 adds a few more most-significant bits */
- header_size >>= hweight32(HDR_LEN_FMASK);
- val |= u32_encode_bits(header_size, HDR_LEN_MSB_FMASK);
+ size = header_size >> hweight32(HDR_LEN_FMASK);
+ val |= u32_encode_bits(size, HDR_LEN_MSB_FMASK);
return val;
}
@@ -425,15 +428,18 @@ static inline u32 ipa_header_size_encoded(enum ipa_version version,
static inline u32 ipa_metadata_offset_encoded(enum ipa_version version,
u32 offset)
{
+ u32 off = offset & field_mask(HDR_OFST_METADATA_FMASK);
u32 val;
- val = u32_encode_bits(offset, HDR_OFST_METADATA_FMASK);
- if (version < IPA_VERSION_4_5)
+ val = u32_encode_bits(off, HDR_OFST_METADATA_FMASK);
+ if (version < IPA_VERSION_4_5) {
+ /* ipa_assert(offset == off); */
return val;
+ }
/* IPA v4.5 adds a few more most-significant bits */
- offset >>= hweight32(HDR_OFST_METADATA_FMASK);
- val |= u32_encode_bits(offset, HDR_OFST_METADATA_MSB_FMASK);
+ off = offset >> hweight32(HDR_OFST_METADATA_FMASK);
+ val |= u32_encode_bits(off, HDR_OFST_METADATA_MSB_FMASK);
return val;
}
--
2.30.1