diff options
Diffstat (limited to 'fs/ext4/ext4_common.c')
| -rw-r--r-- | fs/ext4/ext4_common.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/fs/ext4/ext4_common.c b/fs/ext4/ext4_common.c index 52152a2295a..76f7102456e 100644 --- a/fs/ext4/ext4_common.c +++ b/fs/ext4/ext4_common.c @@ -2181,13 +2181,18 @@ static char *ext4fs_read_symlink(struct ext2fs_node *node) struct ext2fs_node *diro = node; int status; loff_t actread; + size_t alloc_size; if (!diro->inode_read) { status = ext4fs_read_inode(diro->data, diro->ino, &diro->inode); if (status == 0) return NULL; } - symlink = zalloc(le32_to_cpu(diro->inode.size) + 1); + + if (__builtin_add_overflow(le32_to_cpu(diro->inode.size), 1, &alloc_size)) + return NULL; + + symlink = zalloc(alloc_size); if (!symlink) return NULL; @@ -2383,6 +2388,20 @@ int ext4fs_mount(void) fs->inodesz = 128; fs->gdsize = 32; } else { + int missing = __le32_to_cpu(data->sblock.feature_incompat) & + ~(EXT4_FEATURE_INCOMPAT_SUPP | + EXT4_FEATURE_INCOMPAT_SUPP_LAZY_RO); + + if (missing) { + /* + * This code used to be relaxed about feature flags. + * We don't stop the mount to avoid breaking existing setups. + * But, incompatible features can cause serious read errors. + */ + log_err("fs uses incompatible features: %08x, ignoring\n", + missing); + } + debug("EXT4 features COMPAT: %08x INCOMPAT: %08x RO_COMPAT: %08x\n", __le32_to_cpu(data->sblock.feature_compatibility), __le32_to_cpu(data->sblock.feature_incompat), |