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linux/fs/ext4
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Dan Carpenter 37b0b6b8b9 ext4: potential crash on allocation error in ext4_alloc_flex_bg_array() 
If sbi->s_flex_groups_allocated is zero and the first allocation fails
then this code will crash.  The problem is that "i--" will set "i" to
-1 but when we compare "i >= sbi->s_flex_groups_allocated" then the -1
is type promoted to unsigned and becomes UINT_MAX.  Since UINT_MAX
is more than zero, the condition is true so we call kvfree(new_groups[-1]).
The loop will carry on freeing invalid memory until it crashes.

Fixes: 7c990728b9 ("ext4: fix potential race between s_flex_groups online resizing and access")
Reviewed-by: Suraj Jitindar Singh <surajjs@amazon.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: stable@kernel.org
Link: https://lore.kernel.org/r/20200228092142.7irbc44yaz3by7nb@kili.mountain
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
 		2020-02-29 17:48:08 -05:00
..
Kconfig This merge window, we've added some performance improvements in how we 2020-01-30 15:17:05 -08:00
Makefile kunit: allow kunit tests to be loaded as a module 2020-01-09 16:42:29 -07:00
acl.c ext4: compare old and new mode before setting update_mode flag 2018-12-10 00:22:38 -05:00
acl.h ext4: fix up remaining files with SPDX cleanups 2017-12-17 22:00:59 -05:00
balloc.c ext4: fix potential race between online resizing and write operations 2020-02-21 00:37:09 -05:00
bitmap.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
block_validity.c ext4: add cond_resched() to ext4_protect_reserved_inode 2020-02-13 11:56:26 -05:00
dir.c ext4: fix checksum errors with indexed dirs 2020-02-13 11:56:19 -05:00
ext4.h ext4: fix race between writepages and enabling EXT4_EXTENTS_FL 2020-02-21 19:32:07 -05:00
ext4_extents.h ext4: make some functions static in extents.c 2020-01-17 16:24:54 -05:00
ext4_jbd2.c ext4: uninline ext4_inode_journal_mode() 2020-01-17 16:24:52 -05:00
ext4_jbd2.h ext4: uninline ext4_inode_journal_mode() 2020-01-17 16:24:52 -05:00
extents.c ext4: fix extent_status fragmentation for plain files 2020-01-23 12:02:15 -05:00
extents_status.c ext4: use percpu_counters for extent_status cache hits/misses 2019-08-28 11:19:23 -04:00
extents_status.h ext4: fix extent_status trace points 2020-01-25 02:03:03 -05:00
file.c ext4: Optimize ext4 DIO overwrites 2019-12-26 11:57:18 -05:00
fsmap.c ext4: fix miscellaneous sparse warnings 2019-05-12 04:49:47 -04:00
fsmap.h ext4: fix up remaining files with SPDX cleanups 2017-12-17 22:00:59 -05:00
fsync.c ext4: update ext4_sync_file() to not use __generic_file_fsync() 2019-11-05 11:31:40 -05:00
hash.c ext4: fix kernel oops caused by spurious casefold flag 2019-09-03 01:43:17 -04:00
ialloc.c ext4: fix potential race between s_flex_groups online resizing and access 2020-02-21 19:31:46 -05:00
indirect.c ext4: remove ext4_{ind,ext}_calc_metadata_amount() 2020-01-17 16:24:54 -05:00
inline.c ext4,jbd2: fix comment and code style 2020-01-25 02:24:53 -05:00
inode-test.c kunit: allow kunit tests to be loaded as a module 2020-01-09 16:42:29 -07:00
inode.c ext4: rename s_journal_flag_rwsem to s_writepages_rwsem 2020-02-21 19:32:07 -05:00
ioctl.c ext4: Add EXT4_IOC_FSGETXATTR/EXT4_IOC_FSSETXATTR to compat_ioctl 2020-01-17 16:24:55 -05:00
mballoc.c ext4: fix potential race between s_flex_groups online resizing and access 2020-02-21 19:31:46 -05:00
mballoc.h ext4: fix up remaining files with SPDX cleanups 2017-12-17 22:00:59 -05:00
migrate.c ext4: fix race between writepages and enabling EXT4_EXTENTS_FL 2020-02-21 19:32:07 -05:00
mmp.c ext4: don't assume that mmp_nodename/bdevname have NUL 2020-02-13 11:53:10 -05:00
move_extent.c ext4: use jbd2_inode dirty range scoping 2019-06-20 17:26:26 -04:00
namei.c ext4: add cond_resched() to __ext4_find_entry() 2020-02-19 23:53:52 -05:00
page-io.c ext4: fix deadlock allocating crypto bounce page from mempool 2020-01-17 16:24:54 -05:00
readpage.c ext4: remove unneeded check for error allocating bio_post_read_ctx 2020-01-17 16:24:54 -05:00
resize.c ext4: fix potential race between s_flex_groups online resizing and access 2020-02-21 19:31:46 -05:00
super.c ext4: potential crash on allocation error in ext4_alloc_flex_bg_array() 2020-02-29 17:48:08 -05:00
symlink.c ext4: switch to fscrypt_get_symlink() 2018-01-11 22:10:40 -05:00
sysfs.c ext4: export information about first/last errors via /sys/fs/ext4/<dev> 2019-12-26 11:29:10 -05:00
truncate.h ext4: handle layout changes to pinned DAX mappings 2018-07-29 17:00:22 -04:00
verity.c fs-verity: implement readahead of Merkle tree pages 2020-01-14 13:27:32 -08:00
xattr.c ext4: drop ext4_kvmalloc() 2020-01-17 16:24:55 -05:00
xattr.h ext4: add extra checks to ext4_xattr_block_get() 2018-03-30 20:04:11 -04:00
xattr_security.c ext4: use XATTR_CREATE in ext4_initxattrs() 2018-05-10 11:52:14 -04:00
xattr_trusted.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xattr_user.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00