getline() may allocate a buffer even though it returns -1:
"""
If *lineptr is set to NULL before the call, then getline() will allocate
a buffer for storing the line. This buffer should be freed by the user
program even if getline() failed.
"""
This leak has been observed on a RHEL8 system with two CX5 PF devices
(no VFs).
ASan reports:
==8899==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 120 byte(s) in 1 object(s) allocated from:
#0 0x7fe58576aba8 in __interceptor_malloc
(/lib64/libasan.so.5+0xefba8)
#1 0x7fe583e866b2 in __getdelim (/lib64/libc.so.6+0x886b2)
#2 0x327bd23 in mlx5_sysfs_switch_info
../drivers/net/mlx5/linux/mlx5_ethdev_os.c:1084
#3 0x3271f86 in mlx5_os_pci_probe_pf
../drivers/net/mlx5/linux/mlx5_os.c:2282
#4 0x3273c83 in mlx5_os_pci_probe
../drivers/net/mlx5/linux/mlx5_os.c:2497
#5 0x327475f in mlx5_os_net_probe
../drivers/net/mlx5/linux/mlx5_os.c:2578
#6 0xc6eac7 in drivers_probe
../drivers/common/mlx5/mlx5_common.c:937
#7 0xc6f150 in mlx5_common_dev_probe
../drivers/common/mlx5/mlx5_common.c:1027
#8 0xc8ef80 in mlx5_common_pci_probe
../drivers/common/mlx5/mlx5_common_pci.c:168
#9 0xc21b67 in rte_pci_probe_one_driver
../drivers/bus/pci/pci_common.c:312
#10 0xc2224c in pci_probe_all_drivers
../drivers/bus/pci/pci_common.c:396
#11 0xc222f4 in pci_probe ../drivers/bus/pci/pci_common.c:423
#12 0xb71fff in rte_bus_probe ../lib/eal/common/eal_common_bus.c:78
#13 0xbe6888 in rte_eal_init ../lib/eal/linux/eal.c:1300
#14 0x5ec717 in main ../app/test-pmd/testpmd.c:4515
#15 0x7fe583e38d84 in __libc_start_main (/lib64/libc.so.6+0x3ad84)
As far as why getline() errors, strace gives a hint:
8516 openat(AT_FDCWD, "/sys/class/net/enp130s0f0/phys_port_name",
O_RDONLY) = 34
8516 fstat(34, {st_mode=S_IFREG|0444, st_size=4096, ...}) = 0
8516 read(34, 0x621000098900, 4096) = -1 EOPNOTSUPP (Operation
not supported)
Fixes: f8a226ed65fa ("net/mlx5: fix sysfs port name translation")
Cc: sta...@dpdk.org
Signed-off-by: David Marchand <david.march...@redhat.com>
---
drivers/net/mlx5/linux/mlx5_ethdev_os.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/net/mlx5/linux/mlx5_ethdev_os.c
b/drivers/net/mlx5/linux/mlx5_ethdev_os.c
index 639e629fe4..dd5a0c546d 100644
--- a/drivers/net/mlx5/linux/mlx5_ethdev_os.c
+++ b/drivers/net/mlx5/linux/mlx5_ethdev_os.c
@@ -1083,6 +1083,7 @@ mlx5_sysfs_switch_info(unsigned int ifindex, struct
mlx5_switch_info *info)
line_size = getline(&port_name, &port_name_size, file);
if (line_size < 0) {
+ free(port_name);
fclose(file);
rte_errno = errno;
return -rte_errno;
--
2.41.0
