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| author | Jakub Kicinski <jakub.kicinski@netronome.com> | 2018-06-12 07:33:35 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-06-13 01:18:28 +0300 |
| commit | f8d0efb112275444c03b76ee2376f0055d12aeba (patch) | |
| tree | 9f8fa26171bd78e745f45b77ef15db91659dd078 /drivers/net/ethernet | |
| parent | cdb8744d80352b55c622d049a6c91f449cd291f8 (diff) | |
| download | linux-f8d0efb112275444c03b76ee2376f0055d12aeba.tar.xz | |
nfp: don't pad strings in nfp_cpp_resource_find() to avoid gcc 8 warning
Once upon a time nfp_cpp_resource_find() took a name parameter,
which could be any user-chosen string. Resources are identified
by a CRC32 hash of a 8 byte string, so we had to pad user input
with zeros to make sure CRC32 gave the correct result.
Since then nfp_cpp_resource_find() was made to operate on allocated
resources only (struct nfp_resource). We kzalloc those so there is
no need to pad the strings and use memcmp.
This avoids a GCC 8 stringop-truncation warning:
In function ‘nfp_cpp_resource_find’,
inlined from ‘nfp_resource_try_acquire’ at .../nfpcore/nfp_resource.c:153:8,
inlined from ‘nfp_resource_acquire’ at .../nfpcore/nfp_resource.c:206:9:
.../nfpcore/nfp_resource.c:108:2: warning: strncpy’ output may be truncated copying 8 bytes from a string of length 8 [-Wstringop-truncation]
strncpy(name_pad, res->name, sizeof(name_pad));
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet')
| -rw-r--r-- | drivers/net/ethernet/netronome/nfp/nfpcore/nfp_resource.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_resource.c b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_resource.c index 2dd89dba9311..d32af598da90 100644 --- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_resource.c +++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_resource.c @@ -98,21 +98,18 @@ struct nfp_resource { static int nfp_cpp_resource_find(struct nfp_cpp *cpp, struct nfp_resource *res) { - char name_pad[NFP_RESOURCE_ENTRY_NAME_SZ] = {}; struct nfp_resource_entry entry; u32 cpp_id, key; int ret, i; cpp_id = NFP_CPP_ID(NFP_RESOURCE_TBL_TARGET, 3, 0); /* Atomic read */ - strncpy(name_pad, res->name, sizeof(name_pad)); - /* Search for a matching entry */ - if (!memcmp(name_pad, NFP_RESOURCE_TBL_NAME "\0\0\0\0\0\0\0\0", 8)) { + if (!strcmp(res->name, NFP_RESOURCE_TBL_NAME)) { nfp_err(cpp, "Grabbing device lock not supported\n"); return -EOPNOTSUPP; } - key = crc32_posix(name_pad, sizeof(name_pad)); + key = crc32_posix(res->name, NFP_RESOURCE_ENTRY_NAME_SZ); for (i = 0; i < NFP_RESOURCE_TBL_ENTRIES; i++) { u64 addr = NFP_RESOURCE_TBL_BASE + |