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Series of small bug fixes for pstore.

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Merge tag 'please-pull-pstore' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux

Pull pstore fixes from Tony Luck:
 "Series of small bug fixes for pstore"

* tag 'please-pull-pstore' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux:
  pstore: Fix memory leak when decompress using big_oops_buf
  pstore: Fix buffer overflow while write offset equal to buffer size
  pstore: Correct the max_dump_cnt clearing of ramoops
  pstore: Fix NULL pointer fault if get NULL prz in ramoops_get_next_prz
  pstore: skip zero size persistent ram buffer in traverse
  pstore: clarify clearing of _read_cnt in ramoops_context
This commit is contained in:
Linus Torvalds 2014-04-04 15:37:43 -07:00
commit 8e343c8b5c
3 changed files with 14 additions and 10 deletions
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1
fs/pstore/platform.c
View File

@ -497,6 +497,7 @@ void pstore_get_records(int quiet)
big_oops_buf_sz);
if (unzipped_len > 0) {
kfree(buf);
buf = big_oops_buf;
size = unzipped_len;
compressed = false;

19
fs/pstore/ram.c
View File

@ -86,6 +86,7 @@ struct ramoops_context {
struct persistent_ram_ecc_info ecc_info;
unsigned int max_dump_cnt;
unsigned int dump_write_cnt;
/* _read_cnt need clear on ramoops_pstore_open */
unsigned int dump_read_cnt;
unsigned int console_read_cnt;
unsigned int ftrace_read_cnt;
@ -101,6 +102,7 @@ static int ramoops_pstore_open(struct pstore_info *psi)
cxt->dump_read_cnt = 0;
cxt->console_read_cnt = 0;
cxt->ftrace_read_cnt = 0;
return 0;
}
@ -117,13 +119,15 @@ ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max,
return NULL;
prz = przs[i];
if (!prz)
return NULL;
if (update) {
/* Update old/shadowed buffer. */
/* Update old/shadowed buffer. */
if (update)
persistent_ram_save_old(prz);
if (!persistent_ram_old_size(prz))
return NULL;
}
if (!persistent_ram_old_size(prz))
return NULL;
*typep = type;
*id = i;
@ -316,6 +320,7 @@ static void ramoops_free_przs(struct ramoops_context *cxt)
{
int i;
cxt->max_dump_cnt = 0;
if (!cxt->przs)
return;
@ -346,7 +351,7 @@ static int ramoops_init_przs(struct device *dev, struct ramoops_context *cxt,
GFP_KERNEL);
if (!cxt->przs) {
dev_err(dev, "failed to initialize a prz array for dumps\n");
return -ENOMEM;
goto fail_prz;
}
for (i = 0; i < cxt->max_dump_cnt; i++) {
@ -428,7 +433,6 @@ static int ramoops_probe(struct platform_device *pdev)
if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size))
pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size);
cxt->dump_read_cnt = 0;
cxt->size = pdata->mem_size;
cxt->phys_addr = pdata->mem_address;
cxt->record_size = pdata->record_size;
@ -505,7 +509,6 @@ static int ramoops_probe(struct platform_device *pdev)
kfree(cxt->pstore.buf);
fail_clear:
cxt->pstore.bufsize = 0;
cxt->max_dump_cnt = 0;
fail_cnt:
kfree(cxt->fprz);
fail_init_fprz:

4
fs/pstore/ram_core.c
View File

@ -54,7 +54,7 @@ static size_t buffer_start_add_atomic(struct persistent_ram_zone *prz, size_t a)
do {
old = atomic_read(&prz->buffer->start);
new = old + a;
while (unlikely(new > prz->buffer_size))
while (unlikely(new >= prz->buffer_size))
new -= prz->buffer_size;
} while (atomic_cmpxchg(&prz->buffer->start, old, new) != old);
@ -91,7 +91,7 @@ static size_t buffer_start_add_locked(struct persistent_ram_zone *prz, size_t a)
old = atomic_read(&prz->buffer->start);
new = old + a;
while (unlikely(new > prz->buffer_size))
while (unlikely(new >= prz->buffer_size))
new -= prz->buffer_size;
atomic_set(&prz->buffer->start, new);