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ext4 crypto: allocate the right amount of memory for the on-disk symlink

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Previously we were taking the required padding when allocating space
for the on-disk symlink.  This caused a buffer overrun which could
trigger a krenel crash when running fsstress.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o
2015-05-31 13:35:32 -04:00
parent 82d0d3e7e6
commit 4d3c4e5b8c
3 changed files with 37 additions and 21 deletions
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fs/ext4/ext4.h
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@@ -2090,6 +2090,7 @@ static inline int ext4_sb_has_crypto(struct super_block *sb)
/* crypto_fname.c */
bool ext4_valid_filenames_enc_mode(uint32_t mode);
u32 ext4_fname_crypto_round_up(u32 size, u32 blksize);
unsigned ext4_fname_encrypted_size(struct inode *inode, u32 ilen);
int ext4_fname_crypto_alloc_buffer(struct inode *inode,
u32 ilen, struct ext4_str *crypto_str);
int _ext4_fname_disk_to_usr(struct inode *inode,