CVE-2022-49276

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

jffs2: fix memory leak in jffs2_scan_medium

If an error is returned in jffs2_scan_eraseblock() and some memory has been added to the jffs2_summary *s, we can observe the following kmemleak report:

unreferenced object 0xffff88812b889c40 (size 64): comm mount, pid 692, jiffies 4294838325 (age 34.288s) hex dump (first 32 bytes): 40 48 b5 14 81 88 ff ff 01 e0 31 00 00 00 50 00 @H……..1…P. 00 00 01 00 00 00 01 00 00 00 02 00 00 00 09 08 ……………. backtrace: [] __kmalloc+0x613/0x910 [] jffs2_sum_add_dirent_mem+0x5c/0xa0 [] jffs2_scan_medium.cold+0x36e5/0x4794 [] jffs2_do_mount_fs.cold+0xa7/0x2267 [] jffs2_do_fill_super+0x383/0xc30 [] jffs2_fill_super+0x2ea/0x4c0 [] mtd_get_sb+0x254/0x400 [] mtd_get_sb_by_nr+0x4f/0xd0 [] get_tree_mtd+0x498/0x840 [] jffs2_get_tree+0x25/0x30 [] vfs_get_tree+0x8d/0x2e0 [] path_mount+0x50f/0x1e50 [] do_mount+0x107/0x130 [] __se_sys_mount+0x1c5/0x2f0 [] __x64_sys_mount+0xc7/0x160 [] do_syscall_64+0x45/0x70 unreferenced object 0xffff888114b54840 (size 32): comm mount, pid 692, jiffies 4294838325 (age 34.288s) hex dump (first 32 bytes): c0 75 b5 14 81 88 ff ff 02 e0 02 00 00 00 02 00 .u………….. 00 00 84 00 00 00 44 00 00 00 6b 6b 6b 6b 6b a5 ……D…kkkkk. backtrace: [] kmem_cache_alloc_trace+0x584/0x880 [] jffs2_sum_add_inode_mem+0x54/0x90 [] jffs2_scan_medium.cold+0x4481/0x4794 […] unreferenced object 0xffff888114b57280 (size 32): comm mount, pid 692, jiffies 4294838393 (age 34.357s) hex dump (first 32 bytes): 10 d5 6c 11 81 88 ff ff 08 e0 05 00 00 00 01 00 ..l…………. 00 00 38 02 00 00 28 00 00 00 6b 6b 6b 6b 6b a5 ..8…(…kkkkk. backtrace: [] kmem_cache_alloc_trace+0x584/0x880 [] jffs2_sum_add_xattr_mem+0x54/0x90 [] jffs2_scan_medium.cold+0x298c/0x4794 […] unreferenced object 0xffff8881116cd510 (size 16): comm mount, pid 692, jiffies 4294838395 (age 34.355s) hex dump (first 16 bytes): 00 00 00 00 00 00 00 00 09 e0 60 02 00 00 6b a5 ……….`…k. backtrace: [] kmem_cache_alloc_trace+0x584/0x880 [] jffs2_sum_add_xref_mem+0x54/0x90 [] jffs2_scan_medium.cold+0x3a20/0x4794 […]

Therefore, we should call jffs2_sum_reset_collected(s) on exit to release the memory added in s. In addition, a new tag out_buf is added to prevent the NULL pointer reference caused by s being NULL. (thanks to Zhang Yi for this analysis)

Affected Software

References

• https://git.kernel.org/stable/c/455f4a23490bfcbedc8e5c245c463a59b19e5ddd
• https://git.kernel.org/stable/c/51dbb5e36d59f62e34d462b801c1068248149cfe
• https://git.kernel.org/stable/c/52ba0ab4f0a606f02a6163493378989faa1ec10a
• https://git.kernel.org/stable/c/82462324bf35b6b553400af1c1aa265069cee28f
• https://git.kernel.org/stable/c/9b0c69182f09b70779817af4dcf89780955d5c4c
• https://git.kernel.org/stable/c/9cdd3128874f5fe759e2c4e1360ab7fb96a8d1df
• https://git.kernel.org/stable/c/b26bbc0c122cad038831f226a4cb4de702225e16
• https://git.kernel.org/stable/c/b36bccb04e14cc0c1e2d0e92d477fe220314fad6
• https://git.kernel.org/stable/c/e711913463af916d777a4873068f415f1fe2ad33