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| author | Leon Yu <chianglungyu@gmail.com> | 2018-03-06 23:16:24 +0800 |
|---|---|---|
| committer | Jessica Yu <jeyu@kernel.org> | 2018-03-08 21:58:51 +0100 |
| commit | 3f553b308bb004eb730da8e00a28150c157c7724 (patch) | |
| tree | 8d4b221ca45c45763e1d037b9a312cbff91414ed /kernel/module.c | |
| parent | 661e50bc853209e41a5c14a290ca4decc43cbfd1 (diff) | |
| download | linux-3f553b308bb004eb730da8e00a28150c157c7724.tar.gz linux-3f553b308bb004eb730da8e00a28150c157c7724.tar.bz2 linux-3f553b308bb004eb730da8e00a28150c157c7724.zip | |
module: propagate error in modules_open()
otherwise kernel can oops later in seq_release() due to dereferencing null
file->private_data which is only set if seq_open() succeeds.
BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
IP: seq_release+0xc/0x30
Call Trace:
close_pdeo+0x37/0xd0
proc_reg_release+0x5d/0x60
__fput+0x9d/0x1d0
____fput+0x9/0x10
task_work_run+0x75/0x90
do_exit+0x252/0xa00
do_group_exit+0x36/0xb0
SyS_exit_group+0xf/0x10
Fixes: 516fb7f2e73d ("/proc/module: use the same logic as /proc/kallsyms for address exposure")
Cc: Jessica Yu <jeyu@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: stable@vger.kernel.org # 4.15+
Signed-off-by: Leon Yu <chianglungyu@gmail.com>
Signed-off-by: Jessica Yu <jeyu@kernel.org>
Diffstat (limited to 'kernel/module.c')
| -rw-r--r-- | kernel/module.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/module.c b/kernel/module.c index ad2d420024f6..e42764acedb4 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -4228,7 +4228,7 @@ static int modules_open(struct inode *inode, struct file *file) m->private = kallsyms_show_value() ? NULL : (void *)8ul; } - return 0; + return err; } static const struct file_operations proc_modules_operations = { |