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jfs: don't walk off the end of ealist

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Add a check before visiting the members of ea to
make sure each ea stays within the ealist.

Signed-off-by: lei lu <llfamsec@gmail.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
This commit is contained in:
lei lu 2024-05-29 02:30:40 +08:00 committed by Dave Kleikamp
parent 7063b80268
commit d0fa70aca5
1 changed files with 19 additions and 4 deletions
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23
fs/jfs/xattr.c
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@ -795,7 +795,7 @@ ssize_t __jfs_getxattr(struct inode *inode, const char *name, void *data,
size_t buf_size)
{
struct jfs_ea_list *ealist;
struct jfs_ea *ea;
struct jfs_ea *ea, *ealist_end;
struct ea_buffer ea_buf;
int xattr_size;
ssize_t size;
@ -815,9 +815,16 @@ ssize_t __jfs_getxattr(struct inode *inode, const char *name, void *data,
goto not_found;
ealist = (struct jfs_ea_list *) ea_buf.xattr;
ealist_end = END_EALIST(ealist);
/* Find the named attribute */
for (ea = FIRST_EA(ealist); ea < END_EALIST(ealist); ea = NEXT_EA(ea))
for (ea = FIRST_EA(ealist); ea < ealist_end; ea = NEXT_EA(ea)) {
if (unlikely(ea + 1 > ealist_end) ||
unlikely(NEXT_EA(ea) > ealist_end)) {
size = -EUCLEAN;
goto release;
}
if ((namelen == ea->namelen) &&
memcmp(name, ea->name, namelen) == 0) {
/* Found it */
@ -832,6 +839,7 @@ ssize_t __jfs_getxattr(struct inode *inode, const char *name, void *data,
memcpy(data, value, size);
goto release;
}
}
not_found:
size = -ENODATA;
release:
@ -859,7 +867,7 @@ ssize_t jfs_listxattr(struct dentry * dentry, char *data, size_t buf_size)
ssize_t size = 0;
int xattr_size;
struct jfs_ea_list *ealist;
struct jfs_ea *ea;
struct jfs_ea *ea, *ealist_end;
struct ea_buffer ea_buf;
down_read(&JFS_IP(inode)->xattr_sem);
@ -874,9 +882,16 @@ ssize_t jfs_listxattr(struct dentry * dentry, char *data, size_t buf_size)
goto release;
ealist = (struct jfs_ea_list *) ea_buf.xattr;
ealist_end = END_EALIST(ealist);
/* compute required size of list */
for (ea = FIRST_EA(ealist); ea < END_EALIST(ealist); ea = NEXT_EA(ea)) {
for (ea = FIRST_EA(ealist); ea < ealist_end; ea = NEXT_EA(ea)) {
if (unlikely(ea + 1 > ealist_end) ||
unlikely(NEXT_EA(ea) > ealist_end)) {
size = -EUCLEAN;
goto release;
}
if (can_list(ea))
size += name_size(ea) + 1;
}