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authorZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2013-12-28 19:33:23 -0500
committerZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2014-01-11 10:07:22 -0500
commitae97089d49d1795a35a443b7b830ee666028e733 (patch)
tree528eab7122f5a7b4bb0cf1ad220164b3c0438323 /src/journal/journal-file.c
parent47917e4a4a8f1ee00bb7de3e83f7bfd849abf337 (diff)
journal: fix access to munmapped memory in sd_journal_enumerate_unique
sd_j_e_u needs to keep a reference to an object while comparing it with possibly duplicate objects in other files. Because the size of mmap cache is limited, with enough files and object to compare to, at some point the object being compared would be munmapped, resulting in a segmentation fault. Fix this issue by turning keep_always into a reference count that can be increased and decreased. Other callers which set keep_always=true are unmodified: their references are never released but are ignored when the whole file is closed, which happens at some point. keep_always is increased in sd_j_e_u and later on released.
Diffstat (limited to 'src/journal/journal-file.c')
-rw-r--r--src/journal/journal-file.c5
1 files changed, 1 insertions, 4 deletions
diff --git a/src/journal/journal-file.c b/src/journal/journal-file.c
index 275324b672..b3747e37e4 100644
--- a/src/journal/journal-file.c
+++ b/src/journal/journal-file.c
@@ -419,7 +419,6 @@ int journal_file_move_to_object(JournalFile *f, int type, uint64_t offset, Objec
void *t;
Object *o;
uint64_t s;
- unsigned context;
assert(f);
assert(ret);
@@ -428,10 +427,8 @@ int journal_file_move_to_object(JournalFile *f, int type, uint64_t offset, Objec
if (!VALID64(offset))
return -EFAULT;
- /* One context for each type, plus one catch-all for the rest */
- context = type > 0 && type < _OBJECT_TYPE_MAX ? type : 0;
- r = journal_file_move_to(f, context, false, offset, sizeof(ObjectHeader), &t);
+ r = journal_file_move_to(f, type_to_context(type), false, offset, sizeof(ObjectHeader), &t);
if (r < 0)
return r;