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ext2fs_new_inode(): Add sanity check to assure a valid inode number 

Add a sanity check to makesure that even if the superblock field
s_first_inode is insane, that we won't return an invalid inode number.
(The function will return the error EXT2_ET_INODE_ALLOC_FAIL in that
case.)

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
bitmap-optimize
Theodore Ts'o 2009-01-22 15:55:49 -05:00
parent 1f790a7cc1
commit a93d406960
1 changed files with 2 additions and 0 deletions
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2
lib/ext2fs/alloc.c
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@ -120,6 +120,8 @@ errcode_t ext2fs_new_inode(ext2_filsys fs, ext2_ino_t dir,
start_inode = (dir_group * EXT2_INODES_PER_GROUP(fs->super)) + 1;
if (start_inode < EXT2_FIRST_INODE(fs->super))
start_inode = EXT2_FIRST_INODE(fs->super);
if (start_inode > fs->super->s_inodes_count)
return EXT2_ET_INODE_ALLOC_FAIL;
i = start_inode;
do {