From: Daniel Yang <danielyangkang@xxxxxxxxx> commit c290fe508eee36df1640c3cb35dc8f89e073c8a8 upstream. If exfat_load_upcase_table reaches end and returns -EINVAL, allocated memory doesn't get freed and while exfat_load_default_upcase_table allocates more memory, leading to a memory leak. Here's link to syzkaller crash report illustrating this issue: https://syzkaller.appspot.com/text?tag=CrashReport&x=1406c201980000 Reported-by: syzbot+e1c69cadec0f1a078e3d@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: a13d1a4de3b0 ("exfat: move freeing sbi, upcase table and dropping nls into rcu-delayed helper") Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Daniel Yang <danielyangkang@xxxxxxxxx> Signed-off-by: Namjae Jeon <linkinjeon@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/exfat/nls.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/fs/exfat/nls.c +++ b/fs/exfat/nls.c @@ -779,8 +779,11 @@ int exfat_create_upcase_table(struct sup le32_to_cpu(ep->dentry.upcase.checksum)); brelse(bh); - if (ret && ret != -EIO) + if (ret && ret != -EIO) { + /* free memory from exfat_load_upcase_table call */ + exfat_free_upcase_table(sbi); goto load_default; + } /* load successfully */ return ret; Patches currently in stable-queue which might be from danielyangkang@xxxxxxxxx are queue-6.11/exfat-resolve-memory-leak-from-exfat_create_upcase_table.patch
