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authorSudip Mukherjee <sudipm.mukherjee@gmail.com>2020-04-20 18:14:20 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-04-21 11:11:56 -0700
commitdb973a7289dad24e6c017dcedc6aee886579dc3a (patch)
treeabfece7553c0628651f012cf1ea46889c272c900
parent94b7cc01da5a3cc4f3da5e0ff492ef008bb555d6 (diff)
downloadlinux-db973a7289dad24e6c017dcedc6aee886579dc3a.tar.bz2
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.c2
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