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rocker: fix rocker_tlv_put_* functions for KASAN 

Inlining these functions creates lots of stack variables that each take
64 bytes when KASAN is enabled, leading to this warning about potential
stack overflow:

drivers/net/ethernet/rocker/rocker_ofdpa.c: In function 'ofdpa_cmd_flow_tbl_add':
drivers/net/ethernet/rocker/rocker_ofdpa.c:621:1: error: the frame size of 2752 bytes is larger than 1536 bytes [-Werror=frame-larger-than=]

gcc-8 can now consolidate the stack slots itself, but on older versions
we get the same behavior by using a temporary variable that holds a
copy of the inline function argument.

Cc: stable@vger.kernel.org
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81715
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnd Bergmann 2017-09-22 23:29:18 +02:00 committed by David S. Miller
parent a93ad944f4
commit 6098d7ddd6
1 changed files with 30 additions and 18 deletions
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48
drivers/net/ethernet/rocker/rocker_tlv.h
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@ -139,40 +139,52 @@ rocker_tlv_start(struct rocker_desc_info *desc_info)
int rocker_tlv_put(struct rocker_desc_info *desc_info,
int attrtype, int attrlen, const void *data);
static inline int rocker_tlv_put_u8(struct rocker_desc_info *desc_info,
int attrtype, u8 value)
static inline int
rocker_tlv_put_u8(struct rocker_desc_info *desc_info, int attrtype, u8 value)
{
return rocker_tlv_put(desc_info, attrtype, sizeof(u8), &value);
u8 tmp = value; /* work around GCC PR81715 */
return rocker_tlv_put(desc_info, attrtype, sizeof(u8), &tmp);
}
static inline int rocker_tlv_put_u16(struct rocker_desc_info *desc_info,
int attrtype, u16 value)
static inline int
rocker_tlv_put_u16(struct rocker_desc_info *desc_info, int attrtype, u16 value)
{
return rocker_tlv_put(desc_info, attrtype, sizeof(u16), &value);
u16 tmp = value;
return rocker_tlv_put(desc_info, attrtype, sizeof(u16), &tmp);
}
static inline int rocker_tlv_put_be16(struct rocker_desc_info *desc_info,
int attrtype, __be16 value)
static inline int
rocker_tlv_put_be16(struct rocker_desc_info *desc_info, int attrtype, __be16 value)
{
return rocker_tlv_put(desc_info, attrtype, sizeof(__be16), &value);
__be16 tmp = value;
return rocker_tlv_put(desc_info, attrtype, sizeof(__be16), &tmp);
}
static inline int rocker_tlv_put_u32(struct rocker_desc_info *desc_info,
int attrtype, u32 value)
static inline int
rocker_tlv_put_u32(struct rocker_desc_info *desc_info, int attrtype, u32 value)
{
return rocker_tlv_put(desc_info, attrtype, sizeof(u32), &value);
u32 tmp = value;
return rocker_tlv_put(desc_info, attrtype, sizeof(u32), &tmp);
}
static inline int rocker_tlv_put_be32(struct rocker_desc_info *desc_info,
int attrtype, __be32 value)
static inline int
rocker_tlv_put_be32(struct rocker_desc_info *desc_info, int attrtype, __be32 value)
{
return rocker_tlv_put(desc_info, attrtype, sizeof(__be32), &value);
__be32 tmp = value;
return rocker_tlv_put(desc_info, attrtype, sizeof(__be32), &tmp);
}
static inline int rocker_tlv_put_u64(struct rocker_desc_info *desc_info,
int attrtype, u64 value)
static inline int
rocker_tlv_put_u64(struct rocker_desc_info *desc_info, int attrtype, u64 value)
{
return rocker_tlv_put(desc_info, attrtype, sizeof(u64), &value);
u64 tmp = value;
return rocker_tlv_put(desc_info, attrtype, sizeof(u64), &tmp);
}
static inline struct rocker_tlv *