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Guard font functions against invalid font ids. These arguably should never be passed, but this prevents freezes. Fixes FS#12400

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@31075 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Frank Gevaerts 2011-11-27 15:36:03 +00:00
parent dfd5d0684a
commit 6e664f49b1
1 changed files with 4 additions and 2 deletions
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6
firmware/font.c
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@ -135,7 +135,7 @@ static void lock_font_handle(int handle, bool lock)
void font_lock(int font_id, bool lock)
{
if( font_id == FONT_SYSFIXED )
if( font_id < 0 || font_id >= MAXFONTS )
return;
if( buflib_allocations[font_id] >= 0 )
lock_font_handle(buflib_allocations[font_id], lock);
@ -340,6 +340,8 @@ static int find_font_index(const char* path)
const char* font_filename(int font_id)
{
if ( font_id < 0 || font_id >= MAXFONTS )
return NULL;
int handle = buflib_allocations[font_id];
if (handle > 0)
return core_get_name(handle);
@ -582,7 +584,7 @@ int font_load(const char *path)
void font_unload(int font_id)
{
if ( font_id == FONT_SYSFIXED )
if ( font_id < 0 || font_id >= MAXFONTS )
return;
int handle = buflib_allocations[font_id];
if ( handle < 0 )