diff options
| author | Kees Cook <keescook@chromium.org> | 2023-12-13 01:09:57 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2023-12-14 05:32:01 +0300 |
| commit | bc044ae9d64b1b23fa3a3aa5c162afec8348b412 (patch) | |
| tree | 454c4ffd7faf9a07a861897236d5cf5516009b01 /drivers/net/ethernet/chelsio | |
| parent | 84cc99199a34ba894371041caacc95c2a03b3700 (diff) | |
| download | linux-bc044ae9d64b1b23fa3a3aa5c162afec8348b412.tar.xz | |
cxgb3: Avoid potential string truncation in desc
Builds with W=1 were warning about potential string truncations:
drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c: In function 'cxgb_up':
drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c:394:38: warning: '%d' directive output may be truncated writing between 1 and 11 bytes into a region of size between 5 and 20 [-Wformat-truncation=]
394 | "%s-%d", d->name, pi->first_qset + i);
| ^~
In function 'name_msix_vecs',
inlined from 'cxgb_up' at drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c:1264:3: drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c:394:34: note: directive argument in the range [-2147483641, 509]
394 | "%s-%d", d->name, pi->first_qset + i);
| ^~~~~~~
drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c:393:25: note: 'snprintf' output between 3 and 28 bytes into a destination of size 21
393 | snprintf(adap->msix_info[msi_idx].desc, n,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
394 | "%s-%d", d->name, pi->first_qset + i);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Avoid open-coded %NUL-termination (this code was assuming snprintf
wasn't %NUL terminating when it does -- likely thinking of strncpy),
and grow the size of the string to handle a maximal value.
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202312100937.ZPZCARhB-lkp@intel.com/
Cc: Raju Rangoju <rajur@chelsio.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20231212220954.work.219-kees@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net/ethernet/chelsio')
| -rw-r--r-- | drivers/net/ethernet/chelsio/cxgb3/adapter.h | 2 | ||||
| -rw-r--r-- | drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c | 9 |
2 files changed, 5 insertions, 6 deletions
diff --git a/drivers/net/ethernet/chelsio/cxgb3/adapter.h b/drivers/net/ethernet/chelsio/cxgb3/adapter.h index 6d682b7c7aac..9d11e55981a0 100644 --- a/drivers/net/ethernet/chelsio/cxgb3/adapter.h +++ b/drivers/net/ethernet/chelsio/cxgb3/adapter.h @@ -237,7 +237,7 @@ struct adapter { int msix_nvectors; struct { unsigned short vec; - char desc[22]; + char desc[IFNAMSIZ + 1 + 12]; /* Needs space for "%s-%d" */ } msix_info[SGE_QSETS + 1]; /* T3 modules */ diff --git a/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c b/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c index d117022d15d7..2236f1d35f2b 100644 --- a/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c +++ b/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c @@ -380,19 +380,18 @@ static irqreturn_t t3_async_intr_handler(int irq, void *cookie) */ static void name_msix_vecs(struct adapter *adap) { - int i, j, msi_idx = 1, n = sizeof(adap->msix_info[0].desc) - 1; + int i, j, msi_idx = 1; - snprintf(adap->msix_info[0].desc, n, "%s", adap->name); - adap->msix_info[0].desc[n] = 0; + strscpy(adap->msix_info[0].desc, adap->name, sizeof(adap->msix_info[0].desc)); for_each_port(adap, j) { struct net_device *d = adap->port[j]; const struct port_info *pi = netdev_priv(d); for (i = 0; i < pi->nqsets; i++, msi_idx++) { - snprintf(adap->msix_info[msi_idx].desc, n, + snprintf(adap->msix_info[msi_idx].desc, + sizeof(adap->msix_info[0].desc), "%s-%d", d->name, pi->first_qset + i); - adap->msix_info[msi_idx].desc[n] = 0; } } } |