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jffs2: Fix long-standing bug with symlink garbage collection. 

Ever since jffs2_garbage_collect_metadata() was first half-written in
February 2001, it's been broken on architectures where 'char' is signed.
When garbage collecting a symlink with target length above 127, the payload
length would end up negative, causing interesting and bad things to happen.

Cc: stable@kernel.org
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
David Woodhouse 2009-12-16 03:27:20 +00:00
parent 0a032a4df6
commit 2e16cfca6e
1 changed files with 2 additions and 1 deletions
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3
fs/jffs2/gc.c
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@ -700,7 +700,8 @@ static int jffs2_garbage_collect_metadata(struct jffs2_sb_info *c, struct jffs2_
struct jffs2_raw_inode ri;
struct jffs2_node_frag *last_frag;
union jffs2_device_node dev;
char *mdata = NULL, mdatalen = 0;
char *mdata = NULL;
int mdatalen = 0;
uint32_t alloclen, ilen;
int ret;