Re: [PATCH v1] node_device_conf: virNodeDeviceGetSCSITargetCaps: fix memory leak

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On 4/3/24 4:26 AM, Marc Hartmayer wrote:
Make sure the old value in `scsi_target->wwpn` is free'd before replacing it.

==9104== 38 bytes in 2 blocks are definitely lost in loss record 1,943 of 3,250
==9104==    at 0x483B8C0: malloc (vg_replace_malloc.c:442)
==9104==    by 0x4DFB69B: g_malloc (gmem.c:130)
==9104==    by 0x4E1921D: g_strdup (gstrfuncs.c:363)
==9104==    by 0x495D60B: g_strdup_inline (gstrfuncs.h:321)
==9104==    by 0x495D60B: virFCReadRportValue (virfcp.c:62)
==9104==    by 0x4A5F5CB: virNodeDeviceGetSCSITargetCaps (node_device_conf.c:2914)
==9104==    by 0xBF62529: udevProcessSCSITarget (node_device_udev.c:657)
==9104==    by 0xBF62529: udevGetDeviceDetails (node_device_udev.c:1406)
==9104==    by 0xBF62529: udevAddOneDevice (node_device_udev.c:1563)
==9104==    by 0xBF639B5: udevProcessDeviceListEntry (node_device_udev.c:1637)
==9104==    by 0xBF639B5: udevEnumerateDevices (node_device_udev.c:1691)
==9104==    by 0xBF639B5: nodeStateInitializeEnumerate (node_device_udev.c:2009)
==9104==    by 0x49BDBFD: virThreadHelper (virthread.c:256)
==9104==    by 0x5242069: start_thread (in /usr/lib64/libc.so.6)

Signed-off-by: Marc Hartmayer <mhartmay@xxxxxxxxxxxxx>
---
  src/conf/node_device_conf.c | 5 ++++-
  1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/conf/node_device_conf.c b/src/conf/node_device_conf.c
index 32b69aae84f3..14504cbb9c1f 100644
--- a/src/conf/node_device_conf.c
+++ b/src/conf/node_device_conf.c
@@ -2897,6 +2897,7 @@ virNodeDeviceGetSCSITargetCaps(const char *sysfsPath,
      int ret = -1;
      g_autofree char *dir = NULL;
      g_autofree char *rport = NULL;
+    g_autofree char *wwpn = NULL;
VIR_DEBUG("Checking if '%s' is an FC remote port", scsi_target->name); @@ -2912,11 +2913,13 @@ virNodeDeviceGetSCSITargetCaps(const char *sysfsPath,
      scsi_target->rport = g_steal_pointer(&rport);
if (virFCReadRportValue(scsi_target->rport, "port_name",
-                            &scsi_target->wwpn) < 0) {
+                            &wwpn) < 0) {
          VIR_WARN("Failed to read port_name for '%s'", scsi_target->rport);
          goto cleanup;
      }
+ VIR_FREE(scsi_target->wwpn);
+    scsi_target->wwpn = g_steal_pointer(&wwpn);
      scsi_target->flags |= VIR_NODE_DEV_CAP_FLAG_FC_RPORT;
      ret = 0;
base-commit: b902cfece0db71c3421b0bfe0e05d1dbe7890c31


Reviewed-by: Jonathon Jongsma <jjongsma@xxxxxxxxxx>
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