https://bugzilla.kernel.org/show_bug.cgi?id=199183 --- Comment #3 from Wen Xu (wen.xu@xxxxxxxxxx) --- Sorry, it was my mistake. After debugging the kernel again, I found that it crashes here: https://elixir.bootlin.com/linux/v4.15/source/fs/ext4/ext4.h#L2005 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc, const void *address, unsigned int length) { struct { struct shash_desc shash; char ctx[4]; } desc; int err; BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx)); <- sbi->s_chksum_driver may not always be set up and can be NULL, while static inline unsigned int crypto_shash_descsize(struct crypto_shash *tfm) { return tfm->descsize; } the function crypto_shash_descsize() directly dereferences the pointer. By the way, I reproduce it on Linux 4.15.0-12-generic used by latest Ubuntu 18.04. -- You are receiving this mail because: You are watching the assignee of the bug.
