716f919d2d
Below is what happens on R-Car H3ULCB-KF using clean U-Boot
v2019.04-00810-g6aebc0d11a10 and r8a7795_ulcb_defconfig:
=> ### interrupt autoboot
=> gpt verify mmc 1
No partition list provided - only basic check
Verify GPT: success!
=> ### keep calling 'gpt verify mmc 1'
=> ### on 58th call, we are out of memory:
=> gpt verify mmc 1
alloc_read_gpt_entries: ERROR: Can't allocate 0X4000 bytes for GPT Entries
GPT: Failed to allocate memory for PTE
gpt_verify_headers: *** ERROR: Invalid Backup GPT ***
Verify GPT: error!
This is caused by calling is_gpt_valid() twice (hence allocating pte
also twice via alloc_read_gpt_entries()) while freeing pte only _once_
in the caller of gpt_verify_headers(). Fix that by freeing the pte
allocated and populated for primary GPT _before_ allocating and
populating the pte for backup GPT. The latter will be freed by the
caller of gpt_verify_headers().
With the fix applied, the reproduction scenario [1-2] has been run
hundreds of times in a loop w/o running into OOM.
[1] gpt verify mmc 1
[2] gpt verify mmc 1 $partitions
Fixes:
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|---|---|---|
| .. | ||
| Kconfig | ||
| Makefile | ||
| part_amiga.c | ||
| part_amiga.h | ||
| part_dos.c | ||
| part_dos.h | ||
| part_efi.c | ||
| part_iso.c | ||
| part_iso.h | ||
| part_mac.c | ||
| part_mac.h | ||
| part.c | ||