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[lzw] Avoid invalid left shift. 

* src/lzw/ftzopen.c (ft_lzwstate_get_code): Limit `num_bits'.
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Werner Lemberg 2016-08-16 09:46:40 +02:00
parent 8d7b9198e3
commit 548f68d805
2 changed files with 9 additions and 0 deletions
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ChangeLog
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@ -1,3 +1,9 @@
2016-08-16 Werner Lemberg <wl@gnu.org>
[lzw] Avoid invalid left shift.
* src/lzw/ftzopen.c (ft_lzwstate_get_code): Limit `num_bits'.
2016-08-16 Werner Lemberg <wl@gnu.org>
[lzw] Avoid buffer overrun.

3
src/lzw/ftzopen.c
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@ -65,6 +65,9 @@
FT_Int result;
if ( num_bits > LZW_MAX_BITS )
return -1;
if ( state->buf_clear ||
offset >= state->buf_size ||
state->free_ent >= state->free_bits )