CVE-2024-38539

In the Linux kernel, the following vulnerability has been resolved:

RDMA/cma: Fix kmemleak in rdma_core observed during blktests nvme/rdma use siw

When running blktests nvme/rdma, the following kmemleak issue will appear.

kmemleak: Kernel memory leak detector initialized (mempool available:36041) kmemleak: Automatic memory scanning thread started kmemleak: 2 new suspected memory leaks (see /sys/kernel/debug/kmemleak) kmemleak: 8 new suspected memory leaks (see /sys/kernel/debug/kmemleak) kmemleak: 17 new suspected memory leaks (see /sys/kernel/debug/kmemleak) kmemleak: 4 new suspected memory leaks (see /sys/kernel/debug/kmemleak)

unreferenced object 0xffff88855da53400 (size 192): comm "rdma", pid 10630, jiffies 4296575922 hex dump (first 32 bytes): 37 00 00 00 00 00 00 00 c0 ff ff ff 1f 00 00 00 7............... 10 34 a5 5d 85 88 ff ff 10 34 a5 5d 85 88 ff ff .4.].....4.].... backtrace (crc 47f66721): [<ffffffff911251bd>] kmalloctrace+0x30d/0x3b0 [<ffffffffc2640ff7>] allocgidentry+0x47/0x380 [ibcore] [<ffffffffc2642206>] addmodifygid+0x166/0x930 [ibcore] [<ffffffffc2643468>] ibcacheupdate.part.0+0x6d8/0x910 [ibcore] [<ffffffffc2644e1a>] ibcachesetupone+0x24a/0x350 [ibcore] [<ffffffffc263949e>] ibregisterdevice+0x9e/0x3a0 [ibcore] [<ffffffffc2a3d389>] 0xffffffffc2a3d389 [<ffffffffc2688cd8>] nldevnewlink+0x2b8/0x520 [ibcore] [<ffffffffc2645fe3>] rdmanlrcvmsg+0x2c3/0x520 [ibcore] [<ffffffffc264648c>] rdmanlrcvskb.constprop.0.isra.0+0x23c/0x3a0 [ibcore] [<ffffffff9270e7b5>] netlinkunicast+0x445/0x710 [<ffffffff9270f1f1>] netlink_sendmsg+0x761/0xc40 [<ffffffff9249db29>] __sys_sendto+0x3a9/0x420 [<ffffffff9249dc8c>] __x64syssendto+0xdc/0x1b0 [<ffffffff92db0ad3>] dosyscall64+0x93/0x180 [<ffffffff92e00126>] entrySYSCALL64afterhwframe+0x71/0x79

The root cause: rdmaputgidattr is not called when sgidattr is set to ERR_PTR(-ENODEV).