Description
In the Linux kernel, the following vulnerability has been resolved: netrom: Fix memory leak in nr_sendmsg() syzbot reported a memory leak [1]. When function sock_alloc_send_skb() return NULL in nr_output(), the original skb is not freed, which was allocated in nr_sendmsg(). Fix this by freeing it before return. [1] BUG: memory leak unreferenced object 0xffff888129f35500 (size 240): comm "syz.0.17", pid 6119, jiffies 4294944652 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 10 52 28 81 88 ff ff ..........R(.... backtrace (crc 1456a3e4): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4983 [inline] slab_alloc_node mm/slub.c:5288 [inline] kmem_cache_alloc_node_noprof+0x36f/0x5e0 mm/slub.c:5340 __alloc_skb+0x203/0x240 net/core/skbuff.c:660 alloc_skb include/linux/skbuff.h:1383 [inline] alloc_skb_with_frags+0x69/0x3f0 net/core/skbuff.c:6671 sock_alloc_send_pskb+0x379/0x3e0 net/core/sock.c:2965 sock_alloc_send_skb include/net/sock.h:1859 [inline] nr_sendmsg+0x287/0x450 net/netrom/af_netrom.c:1105 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] sock_write_iter+0x293/0x2a0 net/socket.c:1195 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x45d/0x710 fs/read_write.c:686 ksys_write+0x143/0x170 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xa4/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f
Product status
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before f77e538ac4e3adb1882d5bccb7bfdc111b5963d3
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 09efbf54eeaecebe882af603c9939a4b1bb9567e
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 73839497bbde5cd4fd02bbd9c8bc2640780ae65d
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 156a0f6341dce634a825db49ca20b48b1ae9bcc1
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 8d1ccba4b171cd504ecfa47349cb9864fc9d687c
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 51f5fbc1681bdcffcc7d18bf3dfdb2b1278d3977
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (git) before 613d12dd794e078be8ff3cf6b62a6b9acf7f4619
2.6.12
Any version before 2.6.12
5.10.248 (semver)
5.15.198 (semver)
6.1.160 (semver)
6.6.120 (semver)
6.12.64 (semver)
6.18.3 (semver)
6.19 (original_commit_for_fix)
References
git.kernel.org/...c/f77e538ac4e3adb1882d5bccb7bfdc111b5963d3
git.kernel.org/...c/09efbf54eeaecebe882af603c9939a4b1bb9567e
git.kernel.org/...c/73839497bbde5cd4fd02bbd9c8bc2640780ae65d
git.kernel.org/...c/156a0f6341dce634a825db49ca20b48b1ae9bcc1
git.kernel.org/...c/8d1ccba4b171cd504ecfa47349cb9864fc9d687c
git.kernel.org/...c/51f5fbc1681bdcffcc7d18bf3dfdb2b1278d3977
git.kernel.org/...c/613d12dd794e078be8ff3cf6b62a6b9acf7f4619