[dpdk-dev] [PATCH] ether: fix invalid string length in ethdev name comparison
Ananyev, Konstantin
konstantin.ananyev at intel.com
Tue Feb 27 01:15:01 CET 2018
> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Mohammad Abdul Awal
> Sent: Monday, February 26, 2018 11:22 PM
> To: thomas at monjalon.net
> Cc: rkerur at gmail.com; dev at dpdk.org; Awal, Mohammad Abdul <mohammad.abdul.awal at intel.com>
> Subject: [dpdk-dev] [PATCH] ether: fix invalid string length in ethdev name comparison
>
> The current code compares two strings upto the length of 1st string
> (searched name). If the 1st string is prefix of 2nd string (existing name),
> the string comparison returns the port_id of earliest prefix matches.
> This patch fixes the bug by comparing the strings upto the length of larger
> string.
>
> Fixes: 9c5b8d8b9fe ("ethdev: clean port id retrieval when attaching")
>
> Signed-off-by: Mohammad Abdul Awal <mohammad.abdul.awal at intel.com>
> ---
> lib/librte_ether/rte_ethdev.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
> index 0590f0c..8e8097b 100644
> --- a/lib/librte_ether/rte_ethdev.c
> +++ b/lib/librte_ether/rte_ethdev.c
> @@ -563,17 +563,20 @@ rte_eth_dev_get_name_by_port(uint16_t port_id, char *name)
> int
> rte_eth_dev_get_port_by_name(const char *name, uint16_t *port_id)
> {
> - uint32_t pid;
> + uint32_t pid, len, len1, len2;
>
> if (name == NULL) {
> RTE_PMD_DEBUG_TRACE("Null pointer is specified\n");
> return -EINVAL;
> }
>
> + len1 = strlen(name);
> for (pid = 0; pid < RTE_MAX_ETHPORTS; pid++) {
> + len2 = strlen(rte_eth_dev_shared_data->data[pid].name);
> + len = len1 > len2 ? len1 : len2;
> if (rte_eth_devices[pid].state != RTE_ETH_DEV_UNUSED &&
> !strncmp(name, rte_eth_dev_shared_data->data[pid].name,
> - strlen(name))) {
> + len)) {
Why just not simply use strcmp()? :)
> *port_id = pid;
> return 0;
> }
> --
> 2.7.4
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