diff options
| author | Oleg Nesterov <oleg@redhat.com> | 2013-07-03 15:08:16 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-03 16:08:02 -0700 |
| commit | e7fd1549aeb83e34ee0955cdf5dee5d4088508f3 (patch) | |
| tree | ff08986f52f3e870205001290d7d1df5352558b8 | |
| parent | 7f57cfa4e2aa29fabe69e41529fd26578adc9b58 (diff) | |
coredump: format_corename() can leak cn->corename
do_coredump() assumes that format_corename() can only fail if
expand_corename() fails and frees cn->corename. This is not true, for
example cn_print_exe_file() can fail and in this case nobody frees
cn->corename.
Change do_coredump() to always do kfree(cn->corename) after it calls
format_corename() (NULL is fine), change expand_corename() to do nothing
if kmalloc() fails.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Colin Walters <walters@verbum.org>
Cc: Denys Vlasenko <vda.linux@googlemail.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Lennart Poettering <mzxreary@0pointer.de>
Cc: Lucas De Marchi <lucas.de.marchi@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/coredump.c | 18 |
1 files changed, 7 insertions, 11 deletions
diff --git a/fs/coredump.c b/fs/coredump.c index dafafbafa731..11bc368e0017 100644 --- a/fs/coredump.c +++ b/fs/coredump.c @@ -58,16 +58,14 @@ static atomic_t call_count = ATOMIC_INIT(1); static int expand_corename(struct core_name *cn) { - char *old_corename = cn->corename; + int size = CORENAME_MAX_SIZE * atomic_inc_return(&call_count); + char *corename = krealloc(cn->corename, size, GFP_KERNEL); - cn->size = CORENAME_MAX_SIZE * atomic_inc_return(&call_count); - cn->corename = krealloc(old_corename, cn->size, GFP_KERNEL); - - if (!cn->corename) { - kfree(old_corename); + if (!corename) return -ENOMEM; - } + cn->size = size; + cn->corename = corename; return 0; } @@ -157,10 +155,9 @@ static int format_corename(struct core_name *cn, struct coredump_params *cprm) int pid_in_pattern = 0; int err = 0; + cn->used = 0; cn->size = CORENAME_MAX_SIZE * atomic_read(&call_count); cn->corename = kmalloc(cn->size, GFP_KERNEL); - cn->used = 0; - if (!cn->corename) return -ENOMEM; @@ -549,7 +546,7 @@ void do_coredump(siginfo_t *siginfo) if (ispipe < 0) { printk(KERN_WARNING "format_corename failed\n"); printk(KERN_WARNING "Aborting core\n"); - goto fail_corename; + goto fail_unlock; } if (cprm.limit == 1) { @@ -669,7 +666,6 @@ fail_dropcount: atomic_dec(&core_dump_count); fail_unlock: kfree(cn.corename); -fail_corename: coredump_finish(mm, core_dumped); revert_creds(old_cred); fail_creds: |