Mercurial > hg > nginx
comparison src/event/modules/ngx_aio_module.c @ 4489:9806bf07d119
Event pipe: fixed buffer loss in p->length case.
With previous code raw buffer might be lost if p->input_filter() was called
on a buffer without any data and used ngx_event_pipe_add_free_buf() to
return it to the free list. This eventually might cause "all buffers busy"
problem, resulting in segmentation fault due to null pointer dereference in
ngx_event_pipe_write_chain_to_temp_file().
In ngx_event_pipe_add_free_buf() the buffer was added to the list start
due to pos == last, and then "p->free_raw_bufs = cl->next" in
ngx_event_pipe_read_upstream() dropped both chain links to the buffer
from the p->free_raw_bufs list.
Fix is to move "p->free_raw_bufs = cl->next" before calling the
p->input_filter().
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Wed, 22 Feb 2012 11:28:53 +0000 |
parents | d620f497c50f |
children | 466bd63b63d1 |
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4488:d33ce8cd0d70 | 4489:9806bf07d119 |
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