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| author | Sudip Mukherjee <sudipm.mukherjee@gmail.com> | 2020-04-21 03:14:20 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-04-21 20:11:56 +0200 |
| commit | db973a7289dad24e6c017dcedc6aee886579dc3a (patch) | |
| tree | abfece7553c0628651f012cf1ea46889c272c900 | |
| parent | mm: shmem: disable interrupt when acquiring info->lock in userfaultfd_copy path (diff) | |
| download | linux-db973a7289dad24e6c017dcedc6aee886579dc3a.tar.xz linux-db973a7289dad24e6c017dcedc6aee886579dc3a.zip | |
coredump: fix null pointer dereference on coredump
If the core_pattern is set to "|" and any process segfaults then we get
a null pointer derefernce while trying to coredump. The call stack shows:
RIP: do_coredump+0x628/0x11c0
When the core_pattern has only "|" there is no use of trying the
coredump and we can check that while formating the corename and exit
with an error.
After this change I get:
format_corename failed
Aborting core
Fixes: 315c69261dd3 ("coredump: split pipe command whitespace before expanding template")
Reported-by: Matthew Ruffell <matthew.ruffell@canonical.com>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Paul Wise <pabs3@bonedaddy.net>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: <stable@vger.kernel.org>
Link: http://lkml.kernel.org/r/20200416194612.21418-1-sudipm.mukherjee@gmail.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/coredump.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/coredump.c b/fs/coredump.c index f8296a82d01d..408418e6aa13 100644 --- a/fs/coredump.c +++ b/fs/coredump.c @@ -211,6 +211,8 @@ static int format_corename(struct core_name *cn, struct coredump_params *cprm, return -ENOMEM; (*argv)[(*argc)++] = 0; ++pat_ptr; + if (!(*pat_ptr)) + return -ENOMEM; } /* Repeat as long as we have more pattern to process and more output |